The Foreign Intelligence Surveillance Act of 1978 ("FISA" Pub.L. 95–511, 92 Stat. 1783, 50 U.S.C. Ch. 36) is a United States federal law which establishes procedures for the physical and electronic surveillance and collection of "foreign intelligence information" between "foreign powers" and "agents of foreign powers" suspected of espionage or terrorism.
For more detailed information, see our related Constitutional Law terms: