CIA Study Of Assassination: A how-to guide book in the art of political killing, the 19-page manual offers detailed descriptions of the procedures, instruments, and implementation of assassination. The manual also notes that to provide plausible denial, "no assassination instructions should ever be written or recorded." Murder, the drafters state, "is not morally justifiable," and "persons who are morally squeamish should not attempt it."
http://www.gwu.edu/~nsarchiv/NSAEBB/...temala2_1.html http://www.gwu.edu/~nsarchiv/NSAEBB/.../ciaguat2.html
Read this declasified document, its quality is not very good, but you can understand it.
http://www.gwu.edu/~nsarchiv/NSAEBB/...temala1_1.html
(Line 4: The Agency drew up list of individuals for assasination...