International Socialists

• Committee for a Workers' International (1974)
• International Socialist Group
• International Socialist Movement
• International Socialist Organization
• International Socialist Tendency
• International Socialists (Brazil)
• International Socialists (Canada)
• International Socialists (Denmark)
• International Socialists (Netherlands)
• International Socialists (Norway)
• International Socialists (Scotland)
• International Socialists (Sweden)
• International Socialists (United States)
• Scottish Militant Labour
• Scottish Socialist Party
• Socialist Democracy (Ireland)
• Socialist Workers Party (UK)
• Solidarity (U.S.)
• Trotskyist
• reunified Fourth International