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Control of subversive activities. Hearings before a subcommittee of the Committee on the Judiciary, United States Senate, Eighty-first Congress, first session, on S. 1194 and S. 1196, bills to protect the United States against certain un-American and subversive activities. April 29, May 4, 6, 18, 19, and 20, and June 10, 1949