There was a lot of that rumored to have gone on. Foreign news services giving out Oswald's bio and casting him as a suspect before he had even been picked up and booked for Tippit's murder in Dallas.
I was watching a show on the mob and Cuba, and saw a factiod I didn't know before. Jack Ruby visited Trafficante in Castro's jail and helped to arrange his release, this was from a CIA report on Castro's dealings.
I have seen numerous reports that Ruby was just a mob wannabe.