AFL: American Federation of Labor
CIA: Central Intelligence Agency
CIO: Congress of Industrial Organizations
CPUSA: Communist Party USA
HUAC: House Un-American Activities Committee
ILWU: International Longshoremen's & Warehousemen's Union
IWA: International Woodworkers of America
KGB: Committee for State Security (Soviet secret police and espionage agency)
UAW: United Auto Workers
UE: United Electrical, Radio & Machine Workers of America
UMW: United Mine Workers
UN: United Nations
USSR: Union of Soviet Socialist Republics (Soviet Union)
USW: United Steelworkers