I just watched this last night as it was included in Amazon Prime. I have been fascinated about the different accounts of the JFK assassination since my childhood, and the suggested connections between Giancana, Joe Kennedy, JFK, Bobby Kennedy, Jack Ruby, Oswald (if true) in this film are plausible. It moves rather slow for the first hour with interviews with Giancana's daughters, but the last hour ties up some loose ends in the tangled web of the mafia-JFK conspiracy theory.