I happen to know it was Connelly and Johnson.....
Johnson wanted to be Pres. and the only he could be was to have JFK knocked off; Connelly wanted to be Secty. of State to Johnson....then the mob got upset because Bobby was going after them after JFK’s dad paid them to get JFK in office....
MY PROOF: Kunich (the one running for POTUS) said that a ‘tree’ told him and he told Shirley and its come down the grapevine....
Joe K. said he would talk to them when they got together at Christmas. Joe stroked out before that.
I'm not informed enough to believe the conspiracy stories one way or the other, but it seems clear that the mafia had plenty of motivation.