Spry told Tom Mangold in 1989 that James Angleton once claimed to him that he had knocked back at least 22 Soviet defectors as provocations. According to Mangold, the CIA and FBI later concluded all were genuine.
- Namebase SPRY CHARLES C.F.
- Directors-General of Security, ASIO, archived at the Internet Archive, 12 February 2010, accessed 18 February 2013.
- Tom Mangold, Cold Warrior: James Jesus Angleton - The CIA's Master Spy Hunter, Simon and Schuster, 1991, p.209.