Conspiracy theories abound 50 years after one of the most tragic crimes of the 20th century: President John F. Kennedy's assassination. Polls consistently show that a majority of Americans do not believe that Lee Harvey Oswald did not act alone and maybe was not the man behind Kennedy's killing on Nov. 22, 1963. The Warren Commission, the group assembled by President Lyndon B. Johnson to investigate the assassination, concluded that Oswald acted alone. A special House committee in 1979 found that the killing was the result of a conspiracy, but was unable to identify a gunman or a plot's details. In the latest Gallup poll timed for the shooting's 50th anniversary, 61 percent of Americans believe in a conspiracy with the Mafia and the U.S. government as the most popular culprits.
