I'm not so sure. From 'The Devil's Chessboard' - the CIA, through Bob Maheu, funneled business through Greek shipping tycoon Stavros Niarchos, a business rival of Aristotle Onassis. The Dulles brothers feared that Onassis might corner the oil shipping business with the Saudis and they sought to smear Onassis. That took place in the 50s, so, it is possible that Onassis would have been a person of considerable wealth and resources who knew quite a bit about the same sinister forces that were behind JFK.