Giancana helped Kennedy get elected. The WV primary was crucial and Humphrey was favored. The mob was tied to the unions pension fun and delivered the votes to Kennedy. Joe Kennedy had mob res since he and the Italians split up the scotch and hard liquor business during prohibition.
After they were elected they went after the mafia. Giancana sent Johnny Roselli and another guy to Hyannis Port to talk to Joe Kennedy and remind him the mafia had helped the boys get elected. Roselli was a fixer and planner for the mob. The CIA used him to plot against Castro. He’s the one who came up with trying to poison his cigars.
Joe Kennedy said he would talk to the boys when they came for Christmas, but he had a major stroke and reportedly that conversation never took place.
Those are the dots that are connected. but after that, no dots.
The mafia are corrupt but they’re not stupid. If they were going to go after anyone, they would have gone after Bobby who was spearheading (in appearance) this effort. But even that would be very risky. I also have a feeling the mob knew the Kennedy could be bought. I think they were right.
I think Kennedy’s assassination probably took the mob by surprise like it did everyone else.