Perry Fellwock revealed the existence of then ultra secretive National Security Agency (NSA) and its global mass surveillance apparatus and activities, including domestic spying, in a 1971 Ramparts exposé.
[1] In December 2005 Russ Tice helped spark a national controversy over claims that the NSA and the Defense Intelligence Agency (DIA) were engaged in unlawful and unconstitutional wiretaps on American citizens.
Mark Klein is a former AT&T technician who leaked knowledge of his company's cooperation with the NSA in installing network hardware to covertly monitor, capture, and process American telecommunications en masse.
He eventually pleaded to one misdemeanor count for exceeding authorized use of a computer;[13] Jesselyn Radack of the Government Accountability Project (GAP), who helped represent him, called it an act of "civil disobedience.
A series of exposés beginning June 5, 2013 revealed Internet surveillance programs such as PRISM, XKeyscore, and Tempora, as well as the interception of US and European telephone metadata, among other disclosures.