Gerald Ford
Dare we add Nixon?
Ford’s would be assassins were 1) MK Ultra (Squeaky, part of the Manson family), and/or 2) an FBI informant (Sara Jane Moore)....this is a FACT. It came out at her trial. She was in the palm of the FBI, and Squeaky was in the palm of the CIA.
But why did they want Ford to get a fright? Probably because he was the guy who had the goods on JFK because of the Warren Commission. I would guess they wanted to let him know who was in charge, and that he should enjoy being President and not get out of line.