The Manson Murders' explores alternative theories to the 'Helter Skelter' narrative, including possible government ties to Charles Manson.

Tom O'Neill was commissioned by Hollywood-centric film magazine Premiere to investigate exactly what had - by then - happened a mere 30 years earlier, when a small-time criminal, Charles Manson, was unveiled as the mastermind behind one of the most brutal and defining crimes of the 20th century.

Errol Morris' film is built around the theory that Charles Manson learned mind-control techniques from the CIA. But guess what? There's no evidence.