Can't say with any certainty - who can with 100s of versions offered and nearly 60 years since the event. I'd definitely participate in a thread dedicated to the murder of JFK. I'm a JFK assassination junkie for decades having watched and read hundreds of opinions, theories, documentaries - anything related, I'm in.
The ones that made the most sense to me, and that I lean toward are those that portray it as a mob hit.
"According to some sources, Giancana and the Mafia were involved in
John F. Kennedy's victory in the
1960 presidential election. During 1960s, he was recruited by the
Central Intelligence Agency (CIA) in a plot to assassinate Cuban leader
Fidel Castro. Conspiracy theorists consider Giancana along with Mafia leaders
Santo Trafficante Jr. and
Carlos Marcello associated with the
assassination of Kennedy. "
The botched Bay of Pigs debacle infuriated Trifficante, Jr, who'd controlled many of the casinos in Cuba before Castro seized them. He provided much of the inside intelligence assuming he'd regain control when Fidel was offed.
Then, JFK's brother Bobby launched a much publicized push against organized crime, including the same figures like Giancana that had handed the union votes to JFK securing victory in a tight election.
Trifficante, Jr was quoted by his lawyer Frank Ragano as he lay close to death that the target should have been RFK.
"On January 14, 1992, Trafficante's former attorney,
Frank Ragano, told
Jack Newfield of the
New York Post that he relayed a request from Hoffa to Trafficante and
New Orleans boss Carlos Marcello to have Kennedy killed.
[14] He repeated the claim two days later on
ABC's
Good Morning America,
[15] in Newfield's
Frontline report entitled
JFK, Hoffa and Mob broadcast in November 1992,
[16] and again in his 1994 autobiography
Mob Lawyer.
[17] According to Ragano, he met Hoffa at the
Teamsters' headquarters in
Washington, DC, then delivered the message to Trafficante and Marcello in a meeting at the
Royal Orleans Hotel in
New Orleans.
[14][15] He stated he was chosen by Hoffa because, as both Hoffa and Trafficante's lawyer, he could be assured of
attorney-client privilege.
[14] "