The name Rayburn comes to mind. Could that be it?
Eyetalian mafia...
More likely, it's Sam Giancana. He was the head of the Chicago mob when JFK was running for president. Jack Kennedy's father paid him to make sure that Kennedy won Chicago and Illinois.
Sam Giancana, fully expecting expecting to be rewarded handsomely when Kennedy won, was horrified when JFK appointed his brother Bobby as Attorney general.
Bobby Kennedy, instead of reciprocating by giving Giancana political cover, targeted and went after Giancana like they were "enemies going back to the old neighborhood".
Giancana wanted Bobby out of his hair.
Giancana said "If you want to kill a snake, you don't try to cut off its' tail, because the head will just come around and bite you, but if you cut off the head of the snake, the body dies."
So (rumor has it) Giancana had JFK whacked, effectively depriving Bobby of his power as attorney general.
Around five years later, somebody had Bobby whacked. Payback can be a bitch sometimes.