McCarran Act

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McCarran in 1947.

The McCarran Act (a.k.a the Subversive Activities Control Act, Internal Security Act or ISA) of 1950 is a United States federal law sponsored by Sen. Pat McCarran (1876–1954) that required the registration of Communist organizations with the United States Attorney General and established the Subversive Activities Control Board to investigate persons suspected of engaging in subversive activities or otherwise promoting the establishment of a "totalitarian dictatorship," fascist or communist. Members of these groups could not become citizens, and in some cases, were prevented from entering or leaving the country. Citizen-members could be denaturalized in five years.