>> manson responded saying, you're all guilty. >> you are next, all of you. there is a revolution coming very soon. >> the attorney had done the improbable. convicted a killer who hadn't physically done any of the killing. >> vincent did one of the most brilliant jobs of prosecution i think in american legal history. >> two months later, they received their sentence. death. for the tate family, justice seemed to have been served. >> it's what they wanted. it was what they expected. especially with the death penalties. sadly for them, i think they thought that would be the end of it. >> but it was far from it. coming up, manson's power from prison. >> do you think he could still command them to kill?