Foreign Intelligence Surveillance Act

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 prescribes procedures for the physical and electronic surveillance and collection of ""foreign intelligence information"" between ""foreign powers"" and ""agents of foreign powers"" (which may include American citizens and permanent residents suspected of espionage or terrorism). It has been repeatedly amended since the September 11 attacks.