When JFK found out his father used the Chicago mob to help him win the Presidency, he was pissed. That’s why he and Robert hit the mob with RICO actions and whatnot.
His breaking of the mob in the 1960’s is why the mob killed him.
JFK & RFK didn’t break the mob in the ‘60’s and there’s no compelling evidence to convince me that the mob killed JKF.
The mob WAS severely crippled under Reagan’s administration in the 80’s when undercover agent Joe Pistone and others testified against the mob which lead to arrests of major crime family personnel.