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Fourth International, a multinational body composed of Trotskyist organizations that was first formed in opposition to the policies of the Stalin-dominated Third International, or Comintern. The idea of a Fourth International was first presented in the late 1920s by various opponents of the Soviet leader Joseph Stalin, particularly the followers of Leon Trotsky. Trotsky at first opposed the idea, but by July 1933, with the victory of Nazism in Germany, he called for a Fourth...