Robert Crowley (died 2000) was Assistant Deputy Director of Clandestine Operations of the CIA. Crowley, known as “Crow” within the CIA, left secret files with writer Gregory Douglas and instructing him to use them only after Crowley's death. After his passing in 2000, Douglas published a book based on the papers called, Regicide — The Official Assassination of John F. Kennedy (Monte Sano Media, 2002, ISBN 1591482976).
The book purports that there was indeed a conspiracy to kill John F. Kennedy, and that the CIA had a central role in such an assassination.
Web site link: http://www.milmag.com/newsite/features/bookreviews/regicide/
