McCarran Internal Security Act
The
Internal Security Act or
McCarran Act of
1950 required
communist and communist front organizations to register with the
Attorney General. Members of these groups could not become citizens. Citizen-members could be denaturalized in five years.
Congress overrode President
Harry Truman's veto.
Sections of the ISA were gradually ruled unconstitutional by the Supreme Court and it was completely repealed in 1990.
See also: