[AndrewBissell]

"JFK and the Unspeakable" suggests that JFK had signaled his intentions to scale down the Cold War, withdraw from Vietnam, and reign in or disband the CIA after the Bay of Pigs disaster, and was killed by rogue elements in the CIA, probably in concert with military-industrial business interests and organized crime organizations who didn't like the Kennedys shining a light on their own misdeeds either.

There's a reference to this in Scorcese's recent movie "The Irishman": "if they can get a president, they can get a president of a union."