Formed by Harry Truman in 1952, The National Security Agency, or NSA, is a United States intelligence agency responsible for global monitoring, collection, decoding, translation and analysis of information and data for the purposes of foreign intelligence and counterintelligence.

The NSA also is responsible for the protection of U.S. government communications and information systems against penetration and network warfare. It is authorized to perform these duties through clandestine means, including bugging electronic systems and engaging in sabotage through subversive software. The NSA operates as part of the Department of Defense, though it also reports to the Director of National Intelligence.