names were not made public. Some of the 83 were working or had worked for the Army, the Navy, the Government Printing Office, the Department of the Treasury, the Office of War Information, and the Office of Strategic Services. Others were or had been employed at the Federal Telecommunications Laboratories in New Jersey, the secret radar laboratories of the Army Signal Corps in New Jersey, and General Electric defense plants in Massachusetts and New York. Nineteen of the 83, including well known communist party members James S. Allen, Herbert Aptheker, and Earl Browder, were summoned because their writings were being carried in United States Information Agency libraries around the world. The hearings also investigated such matters as communist infiltration of the United Nations; Korean War atrocities; and the transfer to the Soviet Union of occupation currency plates. From December 1952 to July 1953, Robert F. Kennedy was an assistant counsel of PSI. In April 1954, McCarthy's exchange of charges with Secretary of the Army Robert T. Stevens led to the appointment of a special subcommittee of the PSI to investigate the charges. Chaired by Karl E. Mundt of South Dakota, the proceedings became known as the Army–McCarthy hearings. Labor racketeering and organized crime From 1955 until 1972, John Little McClellan of Arkansas chaired the PSI. McClellan continued extensive hearings of the Army Signal Corps at Fort Monmouth, New Jersey, and added new inquiries relating to communist activities in the United States and to business activities and alleged improper activities by Eisenhower Administration appointees and political associates. In the 86th Congress (1957), members of the Subcommittee were joined by Members of the Committee on Labor and Public Welfare on a special committee (the Select Committee on Improper Activities in Labor and Management) to investigate labor racketeering. Chaired by Senator McClellan and staffed by Robert F. Kennedy, the Subcommittee's chief counsel, and other staff members, this special committee directed much of its attention to criminal influence over the International Brotherhood of Teamsters, most famously calling Teamsters' leaders Dave Beck and Jimmy Hoffa to testify. The televised hearings of the special committee also introduced Senators Barry Goldwater and John F. Kennedy to the nation, as well as leading to passage of the Labor Management Reporting and Disclosure Act. After the select committee expired in 1960, the PSI continued to investigate labor racketeering and other labor-related matters. From 1961 through 1968, it also investigated