"This report discusses the results of a staff inquiry into the major CIA programs which involved collection of information about Americans: the Chaos, Merrimac and Resistance programs and the special security investigations undertaken by the Office of Security. One of the main controversies raised by recent practices of the Central Intelligence Agency is the question of intelligence collection about Americans. Unlike the FBI, the CIA was intended to focus on foreign intelligence matters. Charges have been made, however, suggesting that the CIA spied on thousands of Americans and maintained files on many more, all in violation of its statutory charter."
Supplementary Detailed Staff Reports on Intelligence Activities and the Rights of Americans - Book III (1976)