%0 Generic %T Scope of Soviet Activity in the U.S. hearings before the United States Senate Committee on the Judiciary, Subcommittee To Investigate the Administration of the Internal Security Act and Other Internal Security Laws, Eighty-Fifth Congress, first session, on May 16, June 18, July 23, 1957. %U https://ezaccess.libraries.psu.edu/login?url=http://congressional.proquest.com/congcomp/getdoc?HEARING-ID=HRG-1957-SJS-0029