J. Edgar Hoover and the Kennedys disliked each other. The Kennedy family distributed liquor during Prohibition, and recieved many Mafia campaign contributions. They were embarrassed by each others sex lives. JFK had Marilyn Monroe, and Hoover would get drunk at Government parties and offer to give men blowjobs.
and he couldve proved to you
he had King and X set up
Also the party with Newton, Cleaver and Seale