I know what you're thinking on this, the day before the 50th anniversary of the assassination of U.S. President John F. Kennedy: who does boxing promoter Bob Arum think is responsible? Well, the answer lies at Yahoo! Sports, where Kevin Iole has an article with Arum's thoughts:
"I believe that Kennedy was assassinated by Oswald and Oswald alone, but that he was acting as an agent for Castro. I believe it's for that reason that even today, so many years later, that the U.S. will not recognize that Cuban government. It's why there is still an embargo on Cuba. Otherwise, it makes no sense."
... "The Oliver Stone movie was total [expletive]. It was just fiction. And there is all of this other [expletive] out there with these crazy theories. To me, the evidence points at Oswald and no one else, but it's obvious when you know everything else, Oswald was hired to do this for the Cubans."
(I'm not meaning to say it's not an interesting piece worth a read, because it definitely is. Seriously, go read it.)