International, the

Coordinating body established by labour and socialist organizations, including: First International or International Working Men's Association (1864–72), formed in London under Karl Marx; Second International (1889–1940), founded in Paris; Third (Socialist) International or Comintern (1919–43), formed in Moscow by the Soviet leader Lenin, advocating from 1933 a popular front (communist, socialist, liberal) against the German dictator Hitler; Fourth International or Trotskyist International (1938), somewhat indeterminate, anti-Stalinist; Revived Socialist International (1951), formed in Frankfurt, Germany, a largely anticommunist association of social democrats.