Leon Trotsky — Murder in Mexico (September 1, 2007) Peter’s guest today is H. Keith Melton, renowned intelligence historian and owner of the largest collection of espionage artifacts. Keith sheds new light on one of the most notorious intelligence operations of all time—the assassination of exiled Russian revolutionary Leon Trotsky in Mexico in 1940. Keith reconstructs the operation in all its phases, including material from his own original research.