U.S. senator from 1943 to 1955 and 38th district California State Assembly member from 1936 to 1942. Head of the California Senate Factfinding Subcommittee on Un-American Activities ("Tenney Committee") and leader of anti-communist investigations.
Union organizer and president of the United Electrical, Radio, and Machine Workers of America (UE) Local 1414. President of the California Congress of Industrial Organizations (CIO) and member of the Communist Party.