There are three admissions by the mob chieftains involved that it was their conspiracy. Johnny Roselle was another heavily involved and the liaison with the CIA.
When he was about to testify to the House investigation, he wound up chopped to pieces in an oil drum off Trafficanteland. Funny how these witnesses conveniently die when things get too hot.
James R. Hoffa ALSO knew too much and was “eliminated” in 1975 probably by the Giacalone family in Detroit. In 1975 there began a renewed interest in reopening the JFK case which indeed culminated in the HSCA inquiry...