"During and after the First World War, intelligence agencies, including the predecessor of the FBI, engaged in repressive activity. A new Attorney General, Harlan Fiske Stone, sought to stop the investigation of 'political or other opinions.' This restraint was embodied only in an executive pronouncement, however. No statutes were passed to prevent the kind of improper activity which had been exposed. Thereafter, as this narrative will show, the abuses returned in a new form. It is now the responsibility of all three branches of government to ensure that the pattern of abuse of domestic intelligence activity does not recur." Three periods of growth for domestic intelligence are outlined: 1936-1945, 1946-1963, and 1964-1976.
Intelligence Activities and the Rights of Americans - Book II (1976)