Subversive Activities Control Board

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The Subversive Activities Control Board (SACB) was a United States government committee to investigate Communist infiltration of American society during the 1950s Red Scare.

It was organized on November 1, 1950, under authority provided in the McCarran Internal Security Act. The SACB was empowered to order the registration of organizations that it found to be "Communist fronts", "Communist action" groups or "Communist infiltrated" groups. In carrying out this mandate, the SACB was a leader in the U.S. government’s response to the Red Scare. The SACB’s proceedings were thorough and methodical. Hundreds of witnesses testified and were cross-examined by defense lawyers. The decisions and findings of the SACB were subject to judicial review.