Page "History of Soviet and Russian espionage in the United States" Paragraph 17

President Harry S. Truman's Executive Order 9835 of 22 March 1947 tightened protections against subversive infiltration of the US Government, defining disloyalty as membership on a list of subversive organizations maintained by the Attorney General.

However Truman was opposed to the McCarran Internal Security Act of 1950, calling it a " Mockery of the Bill of Rights " and a " long step towards totalitarianism ".