By Lizzie Evanko — Congress passed the Foreign Intelligence Surveillance Act (FISA) in 1978, in an effort to establish a legal framework for the physical and electronic surveillance of foreign entities. FISA allowed the federal government to collect intelligence on any foreign power (or agent of a foreign power) suspected of terrorism or espionage. The act in turn created the Foreign Intelligence Surveillance Court (FISC, or FISA courts, colloquially) to supervise the requests and uses of federal surveillance warrants. The FISA court established judicial review of the covert surveillance activities being carried out, but due to the sensitive nature of intelligence collection methods and information, these courts maintain a high level of secrecy to protect national security.