Errol Morris' new documentary pulls from Tom O'Neill's 2019 book, which disputes much of what we know about the Manson Family.

The movie is credited as an adaptation of Tom O’Neill’s book Chaos: Charles Manson, the CIA, and the Secret History of the Sixties, a sprawling, occasionally off-the-rails investigation that eventually ties Manson to the U.

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.