The head of the House Select Committee of Assassinations investigation in the 1970s no longer believes that the CIA cooperated with their two year probe: Frontline, Interview, G. Robert Blakey. See 2003 Addendum at end of interview.
A copy of the 1963 version of this secrecy oath can be viewed here: Termination secrecy oath of Ross Crozier, August 30, 1963, NARA Record Number: 104-10012-10194.
During the first days of the CIA, his British intelligence friend Kim Philby dubbed Angleton "the driving force of OSO" the CIA's Office of Special Operations: David Martin, Wilderness of Mirrors, (Guilford, Connecticut, Lyons Press: 2003 ed.) pp. 55-56.
Johnson's application was rejected in March 1953 because of her membership in the United World Federalists, the League of Industrial Democracy, and her questionable associates: Memo from Deputy Chief, Security Research Staff/OS to the Deputy Director of Security, 3/10/64 NARA Record Number: 104-10119-10253