Well, heck, it was either Castro or Johnson that had the job done.
Probably both. LBJ, although I wasn't alive during his presidency, was the worst president of the U.S. He and Clinton are alike in that they only cared about themselves and what steps to take to keep power.
LBJ and Hoover did it through their contacts with the mob. They told the Kennedy family that MONGOOSE (JFK and Bobby's attempt to kill Castro) was infiltrated by Castro and turned on JFK.
LBJ was being forced off the ticket in '64 because the Senate was to open new Bobby Baker investigations in Dec. '63. LBJ was looking at prison time. The week following the assassination Senator Ken Keating who was heading the Baken investigation canceled it. LBJ was now our leader in the Cold War.
Hoover was given life-time tenure as head of FBI by LBJ shortly thereafter. Go figure.
Johnson didn't care, he was now president.
Is it possible Oliver Stone had it right?? (cringe)
He should have known that if he escaped death/prosecution from us, Fidel would have had him killed anyway.