"This report describes the Committee's investigation into certain questionable activities of the National Security Agency (NSA). The Committee's primary focus in this phase of its investigation was on NSA's electronic surveillance practices and capabilities, especially those involving American citizens, groups, and organizations. NSA has intercepted and disseminated international communications of American citizens whose privacy ought to be protected under our Constitution. For example, from August 1945 to May 1975, NSA obtained copies of many international telegrams sent to, from, or through the United States from three telegraph companies. In addition, from the early 1960s until 1973, NSA targeted the international communications of certain American citizens by placing their names on a 'watch list.' Intercepted messages were disseminated to the FBI, CIA, Secret Service, Bureau of Narcotics and Dangerous Drugs (BNDD), and the Department of Defense. In neither program were warrants obtained."
Supplementary Detailed Staff Reports on Intelligence Activities and the Rights of Americans - Book III (1976)