| FI - France: Opposition Communiste |
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| FI - France: Organisation Communiste Internationaliste (OCI, Lambertist) |
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| FI - France: Parti Ouvrier Internationaliste POI |
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| FI - France: Tendance Marxiste-Révolutionnaire de la IVe Internationale (TMR, "Pablist") |
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| FI - France: Ligue Communiste LC |
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| FI - France: Parti Communiste Internationaliste PCI |
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| FI - Germany: Gruppe Internationale Marxisten (GIM) (1969 - 1986) |
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| FI - Germany: Internationale Kommunisten Deutschlands (IKD) |
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| FI - Germany: Internationale Sozialistische Linke (ISL, 2001-2016) |
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| FI - Germany: Internationale Sozialistische Organisation (ISO, 2016-) |
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| FI - Germany: Revolutionär Sozialistischer Bund (RSB, 1994-2016) |
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| FI - Greece: Workers' Internationalist League (Healyite) |
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| FI - Greece: Workers' Vanguard (Εργάτικη Πρωτοπορία) |
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| FI - IMT: International Marxist Tendency |
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| FI - Indonesia: Angatan Communis Indonesia (Acoma) |
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| FI - International Committee of the Fourth International (Healiyte) |
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| FI - International Majority Tendency |
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| FI - Israel: Revolutionary Communist League (Ha-Liga Ha-Komunistit Ha-Mahapchanit) |
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| FI - Italy: Lega Comunista Rivoluzionaria (LCR) |
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| FI - Italy: Sinistra Critica (SC) |
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| FI - IVP: International Viewpoint |
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| FI - Japan: Japanese Committee of the Fourth International (JCFI) |
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| FI - Japan: Japanese Revolutionary Communist League (JRCL) |
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| FI - Lebanon: Groupe communiste révolutionnaire (GCR) |
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| FI - Luxemburg: Ligue Communiste Révolutionnaire (LCR) |
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| FI - Mexico: Organización Socialista de los Trabajadores (OST, Lambertist, 1991 - 2008) |
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| FI - Mexico: PRT: Partido Revolucionario de las y los Trabajadores |
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| FI - Netherlands: Internationale Kommunistenbond (IKB) |
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| FI - Netherlands: Rev. Marx. Tendency |
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| FI - Netherlands: Socialistische Alternatieve Politiek (SAP) |
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| FI - Netherlands: Socialistische Arbeiderspartij (SAP) |
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| FI - Organizing Committee of Eastern Europe (Trotskyists) |
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| FI - Peru: Liga Comunista (Healiyte) |
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| FI - Spain: Liga Comunista Revolucionaria (LCR) |
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| FI - Spain: Liga Comunista Revolucionaria-Euskadi Ta Askatasuna (LCR-ETA(VI)) |
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| FI - Sri Lanka: Lanka Sama Samaja Party (LSSP) |
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