United States Senate Subcommittee on Internal Security
The United States Senate's Special Subcommittee to Investigate the Administration of the Internal Security Act and Other Internal Security Laws, 1951–77, known more commonly as the Senate Internal Security Subcommittee (SISS) and sometimes the McCarran Committee, was a subcommittee of the Senate Judiciary Committee, created in the wake of the McCarran Internal Security Act. The subcommittee investigated espionage, subversion, and related topics, similar to the older House Un-American Activities Committee. It had close relationships with the FBI. The Institute of Pacific Relations was the target of its first major investigation. The SISS was quietly disbanded in 1977 as part of a reorganization of the Senate Judiciary Committee.
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