The practice of mass surveillance in the United States took off in the late 1940s, and later grew into a global surveillance program originally code-named "ECHELON", Fiddler, Stephen (1 July 2013).
The practice of mass surveillance in the United States took off in the 1940s, and was greatly expanded in the 1970s. It soon became part of a global surveillance program code-named "ECHELON", Fiddler, Stephen (1 July 2013).