Silent Night, Bloody Night (Also released as Night of the Dark Full Moon and Death House) is a 1972 American horror film directed by Theodore Gershuny and co-produced by Lloyd Kaufman. The film stars Patrick O'Neal and cult actress Mary Woronov in leading roles, with John Carradine in a supporting performance. The plot follows a series of murders that occur in a small town on Christmas Eve after a man inherits a family estate which was once an insane asylum.
Many of the cast and crew members were former Warhol superstars: Mary Woronov, Ondine, Candy Darling, Kristen Steen, Tally Brown, Lewis Love, filmmaker Jack Smith and artist Susan Rothenberg. It was filmed in Oyster Bay, Long Island, New York in 1970 but was not released theatrically until 1972.
(Summary from Wikipedia)