"The astonishing degree of control that Hoover exercised over the Warren Commission gave him the capacity to dictate the "truth" about the assassination of John F. Kennedy. The "infallible" Director of the FBI even managed to convince the Warren Commission to keep from publishing the fact that Jack Ruby had been an FBI informant in 1959. Imagine that! Jack Ruby, the organized crime operative who murdered Lee Harvey Oswald had actually developed a secret alliance with Hoover's FBI and Hoover dominated the Warren Commission so absolutely that he managed to hush it up. The secret relationship between Jack Ruby and Hoover's FBI is one of the links in a long chain of events which connects J. Edgar Hoover and the Mafia to the point where it is practically impossible to distinguish one from the other. Indeed, when Hoover fraudulently insisted that there was no significant link between Jack Ruby and organized crime, the absurd claim was obviously self-serving -Hoover desperately denied Ruby's obvious links to organized crime in order to conceal his own covert relationship with the Mafia."
Mobster, Jack Ruby murders Lee Harvey Oswald.
It also stats Ruby worked for Nixon in the 40's!