U.S. Government Documents Regarding Ben Margolis, 1941-1973
F.B.I. 1937-1949.
F.B.I. Security Indesc. 1953-1959.
F.B.I. House Committee on Un-American Activities. 1955-1963.
F.B.I. Internal Security. 1963.
F.B.I. 1963-1964.
F.B.I. 1964-1973.
U.S. Department of the Treasury. Regulations.
U.S. Naval Investigation Service. 1941-1964.
U.S. Department of State, C.I.A., Department of Justice, Naturalization and Immigration.