Some material in this article may contain graphically explicit material; this may upset certain viewers.
However many people believe that Kennedy's assassiantion was the result of a conspiracy (Jack Ruby himself claimed the assassination was a conspiracy!) (http://www.youtube.com/watch?v=9zd4r4O0o_Y). Some insist that there were one or two more shooters in Dealey Plaza (like the Grassy knoll shooter), some believe that Oswald was framed by the US Government because of his Communist ties, others say that the KGB (Soviet Union Secret Service) or pro-Castro supporters carried out the assassination, while many blame the mafia, Texas oil barons (like the Hunt Brothers) or the Ku Klux Klan for the assassination, and others concluded that the US government (the FBI, CIA, and even Vice-President Lyndon B. Johnson) ordered the assassination because of his lack of interest in fighting an all out war in Vietnam.
There is evidence of a shooter located behind the picket fence; at least 57 witnesses recalled hearing a shot from that direction. When witness Sam Holland (viewing the motorcade from on top of the railroad bridge) went behind the picket fence with several of the railroad workers he supervises following the assassination, they discovered fresh footprints in the mud behind the fence. Holland demonstrated where the prints were discovered during the filming of Mark Lane’s documentary, Rush to Judgement. Holland and several of his workers, such as Thomas Murphy, Richard Dodd, Austin Miller, Walter Winborn, and James Simmons, reported seeing a puff of smoke from the grassy knoll area. Other witnesses such as journalism student Cheryl McKinnon, reporter Ed Johnson, Policeman Earle V. Browne, and Dallas deputy Sheriff W.W Mabra, also observed a puff of smoke from the Grassy knoll area. Both the Zapruder film and the Wiegman film, also show what appears to be smoke from the Grassy knoll area. Furthermore, the Nix film (filmed by Orville Nix), shows what appears to be a man with dark hair peak his head over the picket fence immediately following the head shot - just as the President’s limousine begins to speed away from Dealey Plaza. You can see in the above frame of the Nix film which shows the “man’s” head and hair inside the red circle. Also, two days before the assassination, two police officers observed men with rifles, taking aim over the picket fence.