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The Socialist International (SI) is a global organisation of political parties and labour groups that promote democratic socialism, mainly composed of social democratic parties. Founded in 1951 as a successor to the Labour and Socialist International, it has roots dating back to the late 19th century. The SI includes 132 members from over 100 countries and has influenced governments across Europe. In 2013, a split led to the creation of the Progressive Alliance. Its current leadership, elected at the 2022 Madrid Congress, includes Secretary General Benedicta Lasi of Ghana, President and Spanish Prime Minister Pedro Sánchez, and Vice-President Temirlan Sultanbekov of Kyrgyzstan.

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History

First and Second Internationals (1864–1916)

The International Workingmen's Association, also known as the First International, was the first international body to bring together organisations representing the working class.5 It was formed in London on 28 September 1864 by socialist, communist and anarchist political groups and trade unions.6 Tensions between moderates and revolutionaries led to its dissolution in 1876 in Philadelphia.7

The Second International was formed in Paris on 14 July 1889 as an association of the socialist parties.8 Differences over World War I led to the Second International being dissolved in 1916.

Labour and Socialist International (1919–1940)

The International Socialist Commission (ISC), also known as the Berne International, was formed in February 1919 at a meeting in Bern by parties that wanted to resurrect the Second International.9 In March 1919, Communist parties formed the Communist International ("Comintern"), the Third International, at a meeting in Moscow.10

Some parties did not want to be a part of the resurrected Second International (ISC) or Comintern. They formed the International Working Union of Socialist Parties (IWUSP, also known as Vienna International, Vienna Union, or Two-and-a-Half International) on 27 February 1921 at a conference in Vienna.11 The ISC and the IWUSP joined to form the Labour and Socialist International (LSI) in May 1923 at a meeting in Hamburg.12 The rise of Nazism and the start of World War II led to the dissolution of the LSI in 1940.

Socialist International (1951–present)

The Socialist International was formed in Frankfurt in July 1951 as a successor to the LSI.13

During the post-World War II period, the SI aided social democratic parties in re-establishing themselves when dictatorship gave way to democracy in Portugal (1974) and Spain (1975). Until its 1976 Geneva Congress, the SI had few members outside Europe and no formal involvement with Latin America.14 In the 1980s, most SI parties gave their backing to the Nicaraguan Sandinistas (FSLN), whose democratically elected left-wing government was subject to a campaign to overthrow it backed by the United States, which culminated in the Iran–Contra affair after the Reagan administration covertly continued US support for the Contras after such support was banned by Congress.

In the late 1970s and in the 1980s the SI had extensive contacts and discussion with the two leading powers of the Cold War period, the United States and the Soviet Union, on issues concerning East–West relations and arms control. The SI supported détente and disarmament agreements, such as SALT II, START and INF. They had several meetings and discussion in Washington, D.C., with President Jimmy Carter and Vice President George Bush and in Moscow with Secretaries General Leonid Brezhnev and Mikhail Gorbachev. The SI's delegations to these discussions were led by the Finnish Prime Minister Kalevi Sorsa.15

Since then, the SI has admitted as members an increasing number of parties and organisations from Africa, Asia, Europe, and Latin America (see below for current list).

Following the Tunisian Revolution, the Constitutional Democratic Rally was expelled from the SI in January 2011;16 later that month the Egyptian National Democratic Party was also expelled;17 and as a result of the 2010–2011 Ivorian crisis, the Ivorian Popular Front was expelled in March 2011,18 in accordance with section 7.1 of the statutes of the Socialist International. These decisions were approved at the subsequent SI Congress in Cape Town in 2012 in line with section 5.1.3 of the statutes.19 These were long term ruling parties of one-party states that were overthrown in the protests of the Arab Spring.

Progressive Alliance split (2013)

On 22 May 2013 the Social Democratic Party of Germany along with some other current and former member parties of the SI founded a rival international network of social-democratic parties known as the Progressive Alliance, citing the perceived undemocratic and outmoded nature of the SI,20212223 as well as the Socialist International's admittance and continuing inclusion of undemocratic political movements into the organization. For example, the SPD objected to the continued presence of the Sandinista National Liberation Front and the delayed ouster of the Tunisian Democratic Constitutional Rally and Egyptian National Democratic Party.2425

After the 2012 Congress, the SI underwent major changes as many of the large European parties allowed their membership to lapse – for example the Social Democratic Party of Germany (SPD) and the Swedish Social Democratic Party – or downgraded their membership to observer status – for example, the British Labour Party and the Norwegian Labour Party (DNA). These parties now concentrate their international links on the Progressive Alliance, with the SI's focus now increasingly being on the global south.

Relationship with Latin America

For a long time, the Socialist International remained distant from Latin America, considering the region as a zone of influence of the United States. For example, it did not denounce the coup d'état against Socialist President Jacobo Árbenz in Guatemala in 1954 or the invasion of the Dominican Republic by the United States in 1965. It was not until the 1973 Chilean coup d'état that "a world we did not know" was discovered, explained Antoine Blanca, a diplomat for the French Socialist Party. According to him, solidarity with the Chilean left was "the first challenge worthy of the name, against Washington, of an International which, until then, had done everything to appear subject to American strategy and NATO". Subsequently, notably under the leadership of François Mitterrand, the SI supported the Sandinistas in Nicaragua and other movements in El Salvador, Guatemala, and Honduras in their struggle against US-supported dictatorships.26

In the 1990s, it was joined by non-socialist parties that took note of the economic power of the European countries governed or to be governed by their partners across the Atlantic and calculated the benefits they could derive from it. During this period, "the Socialist International works in a clientist way; some parties come here to rub shoulders with Europeans as if they were in the upper class," says Porfirio Muñoz Ledo, one of the representatives of the Party of the Democratic Revolution (Mexico) at the SI. It is home to "the very centrist Argentinean Radical Civic Union (UCR); the Mexican Institutional Revolutionary Party (PRI), which was not very democratically in power for seventy years; the Colombian Liberal Party—under whose governments the left-wing formation Patriotic Union (1986–1990) was exterminated—introduced the neoliberal model (1990–1994) and to which, until 2002, Álvaro Uribe will belong". In the following decade, many left-wing parties that came to power (in Brazil, Venezuela, Bolivia, Ecuador and El Salvador) preferred to keep their distance from the SI.27

The logo is the fist and rose, based on the 1977 design by José María Cruz Novillo for the Spanish Socialist Workers' Party, itself a variant of the logo drawn by Marc Bonnet for the French Socialist Party in 1969. Variants of the emblem are or were used by several SI member parties.28

Presidents, honorary presidents and secretaries general

Presidents

  • As of 2025, there have been a total of 9 Socialist International presidents.
No.PortraitName(born–died)Term of officePolitical partyCongress(es)CountryVice-president
Took officeLeft officeTime in officeNameCountry
1Morgan Phillips(1902–1963)3 July 19516 July 19576 years, 3 daysLabour PartyI–IV United Kingdom
2Alsing Andersen(1893–1962)6 July 19579 September 19636 years, 65 daysSocial Democratic Party of DenmarkV–VII Denmark
3Erich Ollenhauer(1901–1963)9 September 196314 December 1963 †96 daysSocial Democratic Party of GermanyVIII West Germany
4Bruno Pittermann(1905–1983)5 September 196426 November 197612 years, 82 daysSocialist Party of AustriaIX–XII Austria
5Willy Brandt(1913–1992)26 November 197617 September 199215 years, 296 daysSocial Democratic Party of GermanyXIII–XVIII West Germany
6Pierre Mauroy(1928–2013)17 September 199210 November 19997 years, 54 daysSocialist PartyXIX–XX France
7António Guterres(b. 1949)10 November 199915 June 20055 years, 217 daysSocialist PartyXXI–XXII Portugal
8George Papandreou(b. 1952)30 January 200625 November 202216 years, 300 daysPanhellenic Socialist MovementXXII–XXV Greece
Movement of Democratic Socialists
9Pedro Sánchez(b. 1972)25 November 2022Incumbent2 years, 212 daysSpanish Socialist Workers' PartyXXVI SpainTemirlan Sultanbekov Kyrgyzstan

Honorary presidents

Current and honorary presidents include:29

Secretaries general

Summits

Members

Full members

There are 92 full members:3031

CountryNameAbbrGovernmentNotesLower HouseUpper House
 AlbaniaSocialist Party of Albania323334PSin governmentAdmitted as consultative member in 1999.3536 Promoted to full member in 2003.3774 / 140 (53%)
 AlgeriaSocialist Forces Front383940FFSin oppositionAdmitted as consultative member in 1992.41 Promoted to full member in 1996.42430 / 407 (0%)4 / 144 (3%)
 AndorraSocial Democratic Party4445PSin oppositionPromoted to full member in 2003.46473 / 28 (11%)
 AngolaPopular Movement for the Liberation of Angola48MPLAin governmentAdmitted as observer member in 1996.49 Promoted to full member in 2003.5051124 / 220 (56%)
 ArgentinaRadical Civic Union52UCRin oppositionAdmitted as consultative member in 1996.53 Promoted to full member in 1999.545534 / 257 (13%)13 / 72 (18%)
 ArmeniaArmenian Revolutionary Federation5657ARFin oppositionAdmitted (as Armenian Socialist Party) as observer member in 1996.5859 Promoted (as ASP) to consultative member in 1999.60 Promoted (as ASP) to full member in 2003.6110 / 107 (9%)
 BelarusBelarusian Social Democratic Party (People's Assembly)BSDPextra-parliamentaryAdmitted as observer member in 1999.62 Promoted to consultative member in 2003.63 Promoted to full member in November 2015.64 Officially deregistered in Belarus since 2005.0 / 110 (0%)0 / 64 (0%)
 BelgiumSocialist Party65PSin opposition16 / 150 (11%)6 / 60 (10%)
 BoliviaNational Unity FrontUNextra-parliamentaryPromoted to full member in March 2017.0 / 130 (0%)0 / 36 (0%)
 Bosnia and HerzegovinaSocial Democratic Party of Bosnia and Herzegovina6667SDP BiHin governmentAdmitted as observer member in 1996.68 Promoted to full member in 1999.69706 / 42 (14%)0 / 15 (0%)
 BrazilDemocratic Labour Party71PDTindependentAdmitted as consultative member in 1986.7273 Promoted to full member in 1989.747518 / 513 (4%)2 / 81 (2%)
 BulgariaParty of Bulgarian Social Democrats76PBSDextra-parliamentary0 / 240 (0%)
Bulgarian Socialist Party77BSPin oppositionAdmitted as full member in 2003.787918 / 240 (8%)
 Burkina FasoPeople's Movement for ProgressMPPextra-parliamentaryAdmitted as full member in 2016.800 / 127 (0%)
 CameroonSocial Democratic Front81SDFin oppositionAdmitted as consultative member in 1996.82 Promoted to full member in 1999.83845 / 180 (3%)1 / 100 (1%)
 Cape VerdeAfrican Party for the Independence of Cape Verde85PAICVin oppositionAdmitted as consultative member in 1992.86 Promoted to full member in 1996.878830 / 72 (42%)
 Central African RepublicMovement for the Liberation of the Central African PeopleMLPCin oppositionAdmitted as observer member in 2008.89 Upgraded to full member in 2018.9 / 100 (9%)
 ChadNational Union for Democracy and RenewalUNDRextra-parliamentaryAdmitted as observer member in June/July 2014.90 Upgraded to full member in 2017.0 / 155 (0%)
 ChileParty for Democracy91PPDjunior party in coalitionAdmitted as consultative member in 1992.92 Promoted to full member in 1996.93947 / 155 (5%)6 / 50 (12%)
Radical Party of Chile95PRSDjunior party in coalition4 / 155 (3%)0 / 50 (0%)
Socialist Party of Chile96PSjunior party in coalitionAdmitted as consultative member in 1992.97 Promoted to full member in 1996.989913 / 155 (8%)7 / 50 (14%)
 ColombiaColombian Liberal Party100PLCjunior party in coalitionAdmitted as consultative member in 1992.101 Promoted to full member in 1999.10210332 / 188 (17%)14 / 108 (13%)
 Costa RicaNational Liberation Party104PLNin oppositionFull member since 1987.10519 / 57 (33%)
 CroatiaSocial Democratic Party of Croatia106107SDPin oppositionAdmitted as full member in 1999.10810937 / 151 (25%)
 CyprusEDEK Socialist Party110111EDEKjunior party in coalitionFull member since 1987.112 Promoted to full member in 1992.1133 / 56 (5%)
Cyprus (North)Republican Turkish PartyCTPin oppositionAdmitted as consultative member in 2008 (pending consultation).114 Promoted to full member in June/July 2014.11518 / 50 (36%)
Communal Democracy PartyTDPextra-parliamentaryAdmitted as consultative member in November 2015.116 Promoted to full member in March 2017.0 / 50 (0%)
 Czech RepublicSocial Democracy117118SOCDEMin opposition0 / 200 (0%)1 / 81 (1%)
 Democratic Republic of the CongoUnion for Democracy and Social ProgressUDPSin governmentAdmitted as observer member in 2003.11932 / 500 (6%)0 / 108 (0%)
 Dominican RepublicDominican Revolutionary Party120PRDin oppositionFull member since 1987.1214 / 190 (2%)0 / 32 (0%)
 Equatorial GuineaConvergence for Social Democracy122CPDSextra-parliamentaryAdmitted as consultative member in 1996.123 Promoted to full member in 1999.1241250 / 100 (0%)
 FinlandSocial Democratic Party of FinlandSDPin opposition43 / 200 (22%)
 FranceSocialist Party126PSin opposition63 / 577 (11%)66 / 348 (19%)
 GhanaNational Democratic CongressNDCin governmentAdmitted as consultative member in 2003.127 Promoted to full member in 2008.128183 / 276 (66%)
 GreecePASOK – Movement for ChangePASOK-KINALin oppositionFull member since 1990.12933 / 300 (11%)
 GuatemalaNational Unity of HopeUNEin oppositionAdmitted as full member in 2008.13028 / 160 (18%)
 GuineaRally of the Guinean People131132RPGin oppositionAdmitted (as Guinean People's Assembly) as consultative member in 1999.133 Promoted (as GPA) to full member in 2003.1341351 / 81 (1%)
 HaitiFusion of Haitian Social Democrats136PFSDHextra-parliamentaryFull member since 1989.1370 / 119 (0%)0 / 30 (0%)
Social Democratic Assembly for the Progress of Haiti (RSD)RSDextra-parliamentaryAdmitted as full members in 20181380 / 119 (0%)0 / 30 (0%)
 HungaryHungarian Socialist Party139140MSzPin oppositionAdmitted as observer member in 1992.141142 Promoted to full member in 1996.14310 / 199 (5%)
 IndiaIndian National CongressINCin oppositionOriginally joined in 1993.144 Readmitted as full member December 2014.14599 / 543 (18%)27 / 245 (11%)
 IraqPatriotic Union of KurdistanPUKjunior party in coalitionAdmitted as observer member in 2003.146 Promoted to full member in 2008.14717 / 329 (5%)
 ItalyItalian Socialist PartyPSIextra-parliamentary0 / 400 (0%)0 / 200 (0%)
 JamaicaPeople's National Party148PNPin oppositionFull member since 1952.149 Temporarily demoted to observer member in 2012 due to non-payment of membership fees.15014 / 63 (22%)8 / 21 (38%)
 JapanSocial Democratic Party151SDPin oppositionFull member since 1951 as the Japan Socialist Party.1521 / 465 (0.2%)2 / 248 (0.8%)
 KazakhstanNationwide Social Democratic PartyJSDPin oppositionAdmitted as consultative member in 2012.153 Promoted to full member in November 2015.1544 / 98 (4%)
 KyrgyzstanSocial DemocratsSDKin oppositionLegal successor to the Social Democratic Party of Kyrgyzstan.1 / 90 (1%)
 LebanonProgressive Socialist Party155PSPin oppositionFull member since 1980.1568 / 128 (6%)
 LithuaniaSocial Democratic Party of Lithuania157LSDPin governmentFull member since the 1990s.15852 / 141 (37%)
 LuxembourgLuxembourg Socialist Workers' Party159160LSAP/POSLin oppositionFull member since 1951.16111 / 60 (18%)
 MaliAlliance for Democracy in Mali162ADEMA-PASJin oppositionAdmitted as consultative member in 1996.163 Promoted to full member in 1999.164165 Promoted to full member in 2008.166 Status unclear following the 2020 Malian coup d'état.24 / 147 (16%)
Rally for MaliRPMin oppositionAdmitted as consultative member in 2003.167 Status unclear following the 2020 Malian coup d'état.51 / 147 (35%)
 MaltaLabour Party168PLin governmentFull member since 1955, leading to the entire party being interdicted by the Catholic Church in 1961.169170 Demoted to observer member in 2012 due to non-payment of membership fees.171 Delisted in December 2014. Rejoined in 2025.17243 / 79 (54%)
 MauritaniaRally of Democratic ForcesRFDextra-parliamentaryAdmitted as observer member in 2003.173 Promoted to full member in 2008.1740 / 176 (0%)
 MauritiusLabour Party175PTRin governmentFull member since 1969.17635 / 66 (53%)
Mauritian Militant Movement177MMMin governmentAdmitted as consultative member in 1996.178 Promoted to full member in 2003.179180 Part of the Alliance of the Heart.19 / 66 (29%)
 MexicoInstitutional Revolutionary Party181PRIin oppositionAdmitted as consultative member in 1996.182 Promoted to full member in 2003.18318468 / 500 (14%)13 / 128 (10%)
 MoldovaEuropean Social Democratic Party185PSDEextra-parliamentaryAdmitted as consultative member in 2008.186 Promoted to full member in 2012.187Part of Alliance for European Integration.0 / 101 (0%)
 MongoliaMongolian People's Party188189MPPin governmentAdmitted (as Mongolian People's Revolutionary Party) as observer member in 1999.190191Promoted (as Mongolian People's Revolutionary Party) to full member in 2003.19219368 / 126 (54%)
 MontenegroDemocratic Party of Socialists of Montenegro194DPSin oppositionAdmitted as consultative member in 2003.195 Promoted to full member in 2008.19617 / 81 (21%)
Social Democratic Party of Montenegro197198199SDPextra-parliamentaryAdmitted as observer member in 1996.200 Promoted to consultative member in 1999.201 Promoted to full member in 2003.2022030 / 81 (0%)
 MoroccoSocialist Union of Popular Forces204205206USFPin oppositionPromoted to full member in 1992.20737 / 395 (9%)8 / 120 (7%)
 MozambiqueFrelimo Party208FRELIMOin governmentAdmitted as consultative member in 1996.209 Promoted to full member in 1999.210184 / 250 (74%)
 NamibiaSouth West Africa People's OrganisationSWAPOin governmentPromoted to full member in 2008.21163 / 96 (66%)28 / 42 (67%)
 NepalNepali Congress212213NCin coalitionAdmitted as consultative member in 1989.214 Promoted to full member in 1999.21521688 / 275 (32%)16 / 59 (27%)
 NigerNigerien Party for Democracy and Socialism217PNDSin oppositionAdmitted as consultative member in 1996.218 Promoted to full member in 2003.219220 Status unclear following the 2023 Nigerien coup d'état.79 / 171 (46%)
 PakistanPakistan Tehreek-e-Insaf221PTIin oppositionAdmitted as consultative member in 1982.222 Promoted to full member in 2018.22322410 / 336 (3%)20 / 100 (20%)
 ParaguayProgressive Democratic PartyPDPextra-parliamentaryAdmitted as consultative member in 2008.225 Promoted to full member in November 2015.2260 / 80 (0%)0 / 45 (0%)
 PeruPeruvian Aprista Party227PAPextra-parliamentaryPromoted to full member in 1999.2280 / 130 (0%)
 PhilippinesPhilippine Democratic Socialist PartyPDSPextra-parliamentaryAdmitted as consultative member in 1992.229 Demoted to observer member in 2012 due to non-payment of membership fees.230 Delisted in December 2014. Reinstated in 2019.0 / 316 (0%)0 / 24 (0%)
 PortugalSocialist Party231PSin opposition58 / 230 (25%)
 Puerto RicoPuerto Rican Independence Party232PIPin oppositionConsultative member in 1987, full member in 1994.233 Promoted to full member in 1992.2341 / 51 (2%)1 / 27 (4%)
 RomaniaSocial Democratic Party235236PSDin governmentAdmitted as consultative member in 1996.237 Promoted to full member in 1999.238 PSDR admitted as consultative member in 1992, full member in 2001.239 Admitted as full member in 2003.240 Both parties merged into PSD in 2001.107 / 330 (32%)49 / 136 (36%)
 San MarinoParty of Socialists and Democrats241PSDjunior partner in coalitionConsultative member in 1961, full member in 1980.2424 / 60 (7%)
 SenegalSocialist Party of Senegal243244PSjunior partner in coalitionFull member since the 1970s.245 Boycotted last election.0 / 150 (0%)
 SlovakiaDirection – Social Democracy246SMER-SDin governmentFull member.24742 / 150 (28%)
 South AfricaAfrican National Congress248ANCin governmentAdmitted as full member in 1999.249250159 / 400 (40%)43 / 90 (48%)
 SpainSpanish Socialist Workers' Party251PSOEin governmentFull member since 1951.252121 / 350 (35%)88 / 266 (33%)
 TunisiaDemocratic Forum for Labour and LibertiesFDTLAdmitted as consultative member in 2003.253 Demoted to observer member in 2012 due to non-payment of membership fees.254 Promoted to full member in 2012.255 Boycotted the 2022–23 Tunisian parliamentary election.2560 / 217 (0%)
 TurkeyRepublican People's Party257258259CHPin oppositionTook Social Democratic Populist Party's place in 1995.260135 / 600 (23%)
 UruguayNew Space261262PNEin oppositionAdmitted as consultative member in 1999.263 Promoted to full member in 2003.264265Party does not individually stand in elections but participates as part of the Broad Front.
 VenezuelaA New EraUNTextra-parliamentaryAdmitted as consultative member in 2013.266 Promoted to full member in November 2015.2670 / 277 (0%)
Democratic Action268269ADin oppositionObserver member in 1966, consultative member in 1981, full member mid 1980s.27011 / 277 (4%)
Popular WillVPextra-parliamentaryAdmitted as full member in December 2014.2710 / 277 (0%)
 YemenYemeni Socialist PartyYSPin oppositionAdmitted as observer member in 2003.272 Promoted to consultative member in 2008.273Promoted to full member in 2012.2748 / 301 (3%)

Consultative parties

There are 19 consultative parties:275276

CountryNameAbbrGovernmentNotesLower HouseUpper House
 BotswanaBotswana Democratic PartyBDPin opposition Admitted as consultative member in June/July 2014.2774 / 61 (7%)
 Democratic Republic of the CongoUnified Lumumbist PartyPALUin oppositionAdmitted as observer member in December 2014.278 Upgraded to consultative in 2019.17 / 500 (3%)2 / 108 (2%)
 DjiboutiMovement for Democratic Renewal and DevelopmentMRDAdmitted as consultative members in 2019.
 EswatiniPeople's United Democratic MovementPUDEMOAdmitted as consultative member in 2013.279 Political parties are banned in Eswatini.
 GabonGabonese Progress PartyPGPAdmitted as consultative member in 1996.2800 / 143 (0%)
 GambiaUnited Democratic PartyUDPin oppositionAdmitted as consultative member in 2012.28115 / 58 (26%)
 GeorgiaSocial Democrats for the Development of GeorgiaSDDextra-parliamentaryAdmitted as consultative member in 2013.2820 / 150 (0%)
 GhanaConvention People's PartyCPPextra-parliamentaryAdmitted as consultative member in 20180 / 275 (0%)
 Guinea-BissauAfrican Party for the Independence of Guinea and Cape VerdePAIGCin oppositionAdmitted as consultative member in 2008.28347 / 102 (46%)
 IranDemocratic Party of Iranian KurdistanPDKIAdmitted as observer member in 1996.284 Promoted to consultative member in 2008.285 Officially banned in Iran.
Komala Party of Iranian KurdistanKPIKAdmitted as observer member in 2014286 Promoted to consultative member in 2018287 Officially banned in Iran.
 PalestinePalestinian National Initiative288PNIin oppositionAdmitted as observer member in 2008.289 Promoted to consultative member in 2012.2902 / 132 (2%)
Palestinian Popular Struggle FrontPPSFjunior partner in coalitionAdmitted as consultative member in 2018.0 / 132 (0%)
 Sahrawi RepublicPolisario FrontPOLISARIOin governmentAdmitted as observer member in 2008.291 Promoted to consultative member in 2017.29229351 / 51 (100%)
 São Tomé and PríncipeMovement for the Liberation of São Tomé and Príncipe/Social Democratic PartyMLSTP/PSDin oppositionAdmitted as consultative member in 2013.29418 / 55 (33%)
 SyriaDemocratic Union PartyPYDextra-parliamentary oppositionAdmitted as consultative member in November 2015.2950 / 250 (0%)
 TogoDemocratic Convention of African PeoplesCDPAextra-parliamentary oppositionAdmitted as consultative member in 1999.2960 / 91 (0%)
 UkraineSocial Democratic Party of Ukraine297SDPUextra-parliamentary oppositionAdmitted as consultative member in 2003.2980 / 450 (0%)

Observer parties

There are eight observer parties:299300

CountryNameAbbrGovernmentNotes
 EswatiniSwazi Democratic PartySWADEPAAdmitted as observer member in June/July 2014.301
 IrelandLabour Party302303in opposition
 KenyaLabour Party of KenyaAdmitted as observer member in 2012.304
 KosovoVetëvendosjeVVin governmentAdmitted as observer member in 2018.
 LesothoLesotho Congress for DemocracyLCDjunior party in coalitionAdmitted as observer member in June/July 2014.305
 SerbiaSocial Democratic Party of SerbiaSDPSjunior party in coalitionAdmitted as observer member in 2018.
 SomalilandJustice and Welfare PartyJWPin oppositionAdmitted as observer member in 2013306
 United KingdomLabour Party307in governmentMember since 1951.308 Currently holds a majority in Westminster, following the 2024 United Kingdom general election. Welsh Labour is in government in Wales and London Labour holds the London Mayoralty. The party asked to be downgraded to observer status in February 2013 "in view of ethical concerns, and to develop international co-operation through new networks."309 The request was accepted later that year.
 United Kingdom (Northern Ireland)Social Democratic and Labour Party310311SDLPin oppositionAdmitted as a full member in 1974.312

Former members

CountryNameAbbrNotes
 AlbaniaSocial Democratic Party of Albania313PSDAdmitted as consultative member in 1992.314 Promoted to full member in 1996.315316 Demoted to observer member in 2012 due to non-payment of membership fees.317 Delisted in December 2014.
 AlgeriaNational Liberation FrontFLNExpelled following the 2019 Algerian protests.
 AndorraNew DemocracyNDAdmitted as consultative member in 1999.318
 Antigua and BarbudaAntigua and Barbuda Labour PartyALPAdmitted as consultative member in 2008.319
 ArgentinaPopular Socialist PartyPSPAdmitted as full member in 1992.320 Merged with the Democratic Socialist Party to form the Socialist Party.
Socialist Party321322PSFull member since 1951.323
 AzerbaijanAzerbaijani Social Democratic PartyASDPAdmitted as observer member in 1996.324 Promoted to consultative member in 2003.325 Readmitted as consultative member in June/July 2014.326 Admitted as full member in 2016.327 Party dissolved in 2023.328
 ArubaPeople's Electoral Movement329MEPPromoted to full member in 1992.330 Full member since 1994.331 Delisted in December 2014.
 AustraliaAustralian Labor Party332ALPAdmitted as full member in 1966.333 Delisted in December 2014.
 AustriaSocial Democratic Party of AustriaSPÖAdmitted as a full member in 1951.334 Delisted in 2022.
 BarbadosBarbados Labour Party335BLPAdmitted as full member in 1987.336 Demoted to observer member in 2012 due to non-payment of membership fees.337 Delisted in December 2014.
 BelgiumBelgian Socialist PartyPSB/BSPFounder member. Split in 1978.
ForwardDelisted in 2017.
 BeninDemocratic Union of Progressive ForcesUDFPAdmitted as observer member in 1992.338
Social Democratic Party339PSDAdmitted as consultative member in 1999.340341 Promoted to full member in 2003.342343
 Bosnia and HerzegovinaAlliance of Independent Social DemocratsSNSDAdmitted as consultative member in 2003.344 Promoted to full member in 2008345 Expelled in August 2012.346
 BotswanaBotswana National FrontBNFAdmitted as observer member in 1996.347
 BoliviaRevolutionary Left Movement348MIRAdmitted as consultative member in 1986.349 Consultative member in 1987.350 Promoted to full member in 1992.351352
 BulgariaBulgarian Euro-LeftBEL353Admitted as observer member in 1999.354
 Burkina FasoParty for Democracy and Progress / Socialist Party355PDP/PSAdmitted as full member circa 1995.356 Demoted to observer member in 2012 due to non-payment of membership fees.357 Delisted in December 2014.
 BurundiFront for Democracy in BurundiFRODEBUAdmitted as consultative member in 2003.358 Demoted to observer member in 2012 due to non-payment of membership fees.359 Delisted in December 2014.
 CanadaCo-operative Commonwealth FederationCCFBecame the New Democratic Party in 1961.
 CanadaNew Democratic Party360NDP/NPDDelisted in 2018.361
 Central African RepublicMovement for Democracy and Social ProgressMDPSAdmitted as observer member in 1992.362
 IranKurdistan Democratic PartyKDPAdmitted as a full member in November 2015.363 Party dissolved in 2022.364
 KyrgyzstanSocial Democratic Party of KyrgyzstanSDPK365
 Ivory CoastIvorian Popular Front366FPIAdmitted as consultative member in 1992.367 Promoted to full member in 1996.368369 Expelled in March 2011.370
 ColombiaAlternative Democratic PolePDAFormer observer member. Delisted in December 2014.
M-19 Democratic AllianceAD/M-19Admitted as observer member in 1992.371
 CuraçaoPartido MANMANPromoted to full member in 1989.372 Delisted in 2017.
 DenmarkSocial DemocratsSDFounding member. Withdrew in 2017.
 DominicaDominica Labour PartyDLPAdmitted as consultative member in 1996.373 Demoted to observer member in 2012 due to non-payment of membership fees.374 Delisted in December 2014.
 EcuadorDemocratic Left375PIDMember since 1987.376 Delisted in 2017.
 EgyptEgyptian Social Democratic PartyESDP (or HMDI in Arabic)Admitted as consultative member in 2012.377 Promoted to full member in November 2015.378 Delisted in 2019 due to non-payment of membership fees.
National Democratic Party379NDPAdmitted as full member in 1989.380 Full member since 1992.381 Expelled in January 2011.382383384
 El SalvadorDemocratic PartyPDAdmitted as observer member in 1996.385
 EstoniaSocial Democratic Party386387SDEMember since 1990.388 Withdrew in 2017.
 FijiFiji Labour PartyFLPAdmitted as consultative member in 1992.389 Expelled in 2008, due to the party's participation in a government issued from a military coup.390
 FranceFrench Section of the Workers' InternationalSFIOFounding member. Member in 1951–1969.
 GeorgiaUnion of Citizens of GeorgiaCUGAdmitted as observer member in 1996.391 Party disbanded in 2003.
 GermanySocial Democratic Party of GermanySPDFounding member. Withdrew in 2017.
 GreenlandSiumutAdmitted as consultative member in 1986.392 Demoted to observer member in 2012 due to non-payment of membership fees.393 Delisted in December 2014.
 GuatemalaSocial Democratic Convergence394CSDAdmitted as consultative member in 2003.395396
 HaitiParty of the National Congress of Democratic MovementsKONAKOMAdmitted as consultative member in 1992.397 Promoted to full member in 1996.398
Struggling People's OrganizationOPLAdmitted (as Lavalas Political Organisation) as observer member in 1996.399
Revolutionary Progressive Nationalist PartyPANPRAAdmitted as consultative member in 1989.400 Promoted to full member in 1992.401
 HungarySocial Democratic Party of HungaryMSZDPMember since 1990. Admitted as observer member in 1992. Promoted to consultative member in 1999.

Promoted to full member in 2003. Delisted in 2020 due to inactivity

 IcelandSocial Democratic PartyAMember since 1987.402 Formed Social Democratic Alliance in 2000.
Social Democratic AllianceSWithdrew in 2017.
 IranLeague of Iranian SocialistsJoined in 1960.403 It was dissolved in 1980s.
 IsraelIsraeli Labor Party404405AvodaUntil May 2020, it temporarily suspended membership in July 2018 over SI's adoption of BDS policies.406
MeretzMerged with Israeli Labor Party to form The Democrats in 2024.
 ItalyDemocratic Party of the LeftPDSAdmitted as full member in 1992.407 Merged with others to form Democrats of the Left in 1998.
Democrats of the Left408DSFull member since 1992 as Democratic Party of the Left.409 Merged with other movements to form the Democratic Party in 2007. Listed as SI member until XXIV Congress in 2012.
Italian Socialist PartyPSIParty dissolved in 1994 and succeeded by the Italian Socialists (who formed the Italian Democratic Socialists in 1998 and resumed as the Italian Socialist Party in 2007).
Italian Democratic Socialist PartyPSDIFounding member. Party merged into the Italian Democratic Socialists in 1998 (renamed into Italian Socialist Party in 2007).
 JapanDemocratic Socialist PartyDSP/Minsha-tōAdmitted as SI member in 1961.410 Merged with non-socialist movements to form the New Frontier Party in 1994.
Japan Socialist PartyJSP/Shakai-tōAdmitted as SI member in 1951.411 Refounded as the Social Democratic Party in 1996.
 JordanJordanian Democratic Party of the LeftJDPLAdmitted as observer member in 2003.412
 KyrgyzstanAta Meken Socialist Party413Admitted as observer member in 2008.414
 LatviaLatvian Social Democratic Workers' Party415LSDSPFull member since 1994.416 Demoted to observer member in 2012 due to non-payment of membership fees.417 Delisted in December 2014.
Social Democratic Party "Harmony"SDPSAdmitted as consultative member in June/July 2014.418 Withdrew in 2017.
 North MacedoniaSocial Democratic Union of Macedonia419420421SDSMAdmitted as observer member in 1996.422 Promoted to full member in 2003.423424 Demoted to observer member in 2012 due to non-payment of membership fees.425 Delisted in December 2014.
 MadagascarParty for National UnityVITMAdmitted as consultative member in 1989.426
 MalaysiaDemocratic Action Party427428DAPFull member since 1987.429 Delisted in 2017.430
 MexicoParty of the Democratic Revolution431PRDAdmitted as full member in 1996.432433
 MoldovaSocial Democratic Party of MoldovaPSDMAdmitted as observer member in 1996.434
 MongoliaMongolian Social Democratic Party435MSDPAdmitted as consultative member in 1992.436437 Promoted to full member in 1996.438 Merged with others in 2000 to form the Democratic Party.
 NamibiaCongress of DemocratsCoDAdmitted as consultative member in 2003.439 Demoted to observer member in 2012 due to non-payment of membership fees.440 Delisted in December 2014.
 NetherlandsLabour Party441PvdADecided to minimise involvement in SI in December 2012.442 Delisted in December 2014.
 New ZealandNew Zealand Labour Party443NZLPMember since 1952.444 Demoted to observer member in 2012 due to non-payment of membership fees.445 Delisted in December 2014.
NicaraguaSandinista National Liberation FrontFSLNExpelled in January 2019 because of violation of human rights during the Nicaraguan protests
 NigeriaAll Progressives Congress446APCAdmitted as consultative member in December 2014.447
 North VietnamVietnamese Socialist Party448Consultative member between 1955 and 1969.449
 NorwayLabour Party450451DNAMember since 1951.452 Withdrew in 2016.
 ParaguayParty for a Country of Solidarity453PPSAdmitted as consultative member in 2003.454 Promoted to full member in 2008.455
Revolutionary Febrerista Party456457PRFAdmitted as full member in the 1970s.458
 PhilippinesAkbayanAdmitted as consultative member in 2003.459
 PolandDemocratic Left Alliance460461SLDFull member since 1996.462 Withdrew in 2017.
Labour Union463UPAdmitted as full member in 1996.464465 Demoted to observer member in 2012 due to non-payment of membership fees.466 Delisted in December 2014.
Social Democracy of the Republic of PolandSdRPAdmitted as full member in 1996.467 Absorbed into the Democratic Left Alliance in 1999.
 RomaniaDemocratic PartyPDAdmitted as consultative member in 1996.468 Promoted to full member in 1999.469 Merged with the Liberal Democratic Party to form the Democratic Liberal Party.
 RussiaA Just Russia — Patriots — For Truth470471SRZPAdmitted as observer member in 2008.472 Promoted to consultative member in 2010. Promoted to full member in 2012.473474 Expelled in March 2022 for its support for the Russian invasion of Ukraine.475
 RussiaSocial Democratic Party of RussiaSDPRAdmitted as consultative member in 2003.476
 Saint Kitts and NevisSaint Kitts and Nevis Labour PartySKNLPAdmitted as consultative member in 1992.477 Demoted to observer member in 2012 due to non-payment of membership fees.478 Delisted in December 2014.
 Saint LuciaProgressive Labour PartyExpelled in 1992.479
Saint Lucia Labour PartySLPAdmitted as consultative member in 1992.480 Demoted to observer member in 2012 due to non-payment of membership fees.481 Delisted in December 2014.
 Saint Vincent and the GrenadinesSaint Vincent Labour PartySVGLPAdmitted as consultative member in 1989.482 Merged with the Movement for National Unity in 1994 to form the Unity Labour Party.
Unity Labour PartyULPDemoted to observer member in 2012 due to non-payment of membership fees.483 Delisted in December 2014.
 SerbiaDemocratic Party484DSAdmitted as consultative member in 2003.485 Promoted to full member in 2008.486
Social Democratic Party487SDPAdmitted as consultative member in 2003.488 Promoted to full member in 2008.489Demoted to observer member in 2012 due to non-payment of membership fees.490 Ceased to exist in 2009491
 SingaporePeople's Action PartyPAPResigned in 1976 in response to the Dutch Labour Party's charges of violations of human rights and detention of political prisoners without trial,492 and DLP and the British Labour Party's charges of media censorship.493494
 SlovakiaParty of the Democratic LeftSDĽAdmitted as full member in 1996.495 Merged with Direction – Social Democracy in 2005.
Social Democratic Party of SlovakiaSDSSAdmitted as full member in 1992.496 Merged with Direction – Social Democracy in 2005.
 SloveniaSlovenian Democratic PartySDSAdmitted (as the Social Democratic Party of Slovenia) as observer member in 1992.497
Social Democrats498SDAdmitted (as United List of Social Democrats) as full member in 1996.499500 Demoted to observer member in 2012 due to non-payment of membership fees.501 Delisted in December 2014.
 SwedenSwedish Social Democratic PartySAPWithdrew in March 2017.502
 SwitzerlandSocial Democratic Party of Switzerland503SP/PSWithdrew in 2017.
 TanzaniaChama Cha MapinduziCCMAdmitted as full member in 2013.
 Timor-LesteRevolutionary Front for an Independent East TimorFRETILINAdmitted as consultative member in 2003.504
 TunisiaDemocratic Constitutional Rally505RCDAdmitted as full member in 1989.506 Full member since 1993.507 Expelled in January 2011.508
Popular Unity MovementMUPAdmitted as consultative member in 1989.509
 TurkeyDemocratic Left PartyDSPAdmitted as consultative member in 1986.510 Expelled in 1992.511
Democratic People's PartyDEHAPAdmitted as observer member in 2003.512 Merged with the Democratic Society Movement to form the Democratic Society Party which in turn was succeeded by the Peace and Democracy Party.
Social Democracy Party513SODEPFull member since 1990.514 Merged with the Republican People's Party in 1995.515
Social Democratic Populist PartySHPAdmitted as consultative member in 1986.516 Promoted to full member in 1989.517 Merged with the Republican People's Party in 1995.
 UkraineSocialist Party of UkraineSPUAdmitted as consultative member in 2003.518 Expelled in July 2011.519
 United StatesDemocratic Socialists of AmericaDSAHad been a member of SI since founding in 1982, withdrew in August 2017.520
Democratic Socialist Organizing CommitteeDSOCMember since 1976,521 merged with the New American Movement in 1982 to form the Democratic Socialists of America, which remained a member until 2017.522
Social Democrats, USA523SDUSAMember since 1972.524 Withdrew in 2005.
 UruguayParty for the Government of the PeoplePGPAdmitted as consultative member in 1992.525 Merged with the Colorado Party in 1994.
Socialist Party of Uruguay526PSUAAdmitted as full member in 1999.527528 Withdrew in 2017.529
 VenezuelaFor Social DemocracyPODEMOSAdmitted as consultative member in 2008.530
Movement for SocialismMASAdmitted as consultative member in 2003.531
 ZambiaPatriotic FrontPFAdmitted as consultative member in 2013.532
 ZimbabweMovement for Democratic ChangeMDCAdmitted as full member in 2008.533 Delisted in 2017.

Fraternal organisations

Associated organisations

See also

  • Socialism portal

Leftist Internationals include:

United left wing

Anarchist

Socialist and labour

Communist

Trotskyist

Democratic socialism

  • Socialist International (est. 1951)

Reunification efforts

  • Fifth International, a phrase referring to socialist and communist groups aspiring to create a new workers' international

Notes

Further reading

References

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  2. "About Us". Socialist International. http://www.socialistinternational.org/about.cfm

  3. Nathan Gilbert Quimpo (2020). "The Post-war Rise and Decline of the Left". In Toby Carroll; Shahar Hameiri; Lee Jones (eds.). The Political Economy of Southeast Asia: Politics and Uneven Development Under Hyperglobalisation. Springer Nature. p. 150. ISBN 978-3-03-028255-4. 978-3-03-028255-4

  4. "Presidium". Socialist International. http://www.socialistinternational.org/viewArticle.cfm?ArticleID=11

  5. Lamb & Docherty 2006, p. 176. - Lamb, Peter; Docherty, James C. (2006). Historical Dictionary of Socialism (Second ed.). The Scarecrow Press. ISBN 978-0-8108-5560-1. Archived from the original on 23 February 2014. Retrieved 12 September 2017. https://web.archive.org/web/20140223115609/http://www.scribd.com/doc/34254398/Docherty-Historical-Dictionary-of-Socialism

  6. Lamb & Docherty 2006, p. xxiv. - Lamb, Peter; Docherty, James C. (2006). Historical Dictionary of Socialism (Second ed.). The Scarecrow Press. ISBN 978-0-8108-5560-1. Archived from the original on 23 February 2014. Retrieved 12 September 2017. https://web.archive.org/web/20140223115609/http://www.scribd.com/doc/34254398/Docherty-Historical-Dictionary-of-Socialism

  7. Lamb & Docherty 2006, p. xxv. - Lamb, Peter; Docherty, James C. (2006). Historical Dictionary of Socialism (Second ed.). The Scarecrow Press. ISBN 978-0-8108-5560-1. Archived from the original on 23 February 2014. Retrieved 12 September 2017. https://web.archive.org/web/20140223115609/http://www.scribd.com/doc/34254398/Docherty-Historical-Dictionary-of-Socialism

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