Summary

Communist activists took a strong interest in American trade unions from the 1920s through the 1950s and played an important role in shaping the nature of the American union movement. Initial communist trade union activism drew upon radical labor traditions that preceded the formation of the American Communist Party (CPUSA). Early communist trade unionists experimented with different types of structures to organize unorganized workers. They also struggled with international communist factionalism. Communist trade unionists were most effective during the Great Depression and World War II. In those years, communist activists helped build the Congress of Industrial Organizations (CIO) and bring industrial unionism to previously unorganized workers. Throughout the history of communist involvement in the US labor movement, international communist policy guided general organizing strategies. Shifts in international policy, such as the announcement of a Soviet non-aggression pact with Germany, proved politically difficult to navigate on the local level. Yet, Left-led unions proved to be more democratically run and focused on racial and gender equality than many of those without communist influence. Their leadership supported social justice and militant action. The Cold War years witnessed CIO purges of Left-led unions and federal investigations and arrests of communist trade unionists. Repression from both within and without the labor movement as well as the CPUSA’s own internal policy battles ultimately ended communist trade unionists’ widespread influence on American trade unions.