Betrayal in Dallas: LBJ, the Pearl Street Mafia, and the Murder of President Kennedy by Mark North
[PDF file]: […] assumes that Ruby was killing Oswald on behalf of the Dallas mob, who (the author believes) had shot Kennedy. But this is only an assumption; and when Ruby did drop hints about the Kennedy killing while in prison, he pointed people not at Civello and the Dallas gambling- drugs network, but at LBJ. Robin Ramsay