"[Lyndon] Johnson himself suspected that Cuba's desire for retribution against Kennedy -- who had consistently sought to destabilize, overthrow or kill Castro -- had played a role in the assassination. In more mystical moods, he would see the crime as 'divine retribution' for the Kennedy-supported coup against South Vietnamese president Ngo Dinh Diem."
<http://www.nytimes.com/2004/10/31/books/review/31MALLONL.html>
Carl