The Manson Massacre (1971)

A monk-robed Manson-like cult leader who lives in a coffin, is transported around in a black hearse. At times he gets sadistic with his girl followers. Ivor, the cult leader , is taking in various young woman and seducing them before sending them out to do his evil acts. We also get to see flashbacks of the early Cult family and the start of his madness.