Long feared to be a "lost" film, a single print is now known to exist which is German language-overdubbed without subtitles.
Filmed in 1970, not released until 1971.
Quentin Tarantino owns a 35mm print of THE MANSON MASSACRE that is in the original English language.
Written and directed by Albert Zugsmith under the pseudonym "Kentucky Jones," possibly to avoid being hassled by members of the Manson Family.
The trailer for this film is available as a special feature on American Genre Film Archive's 2023 Blu-Ray edition of The Zodiac Killer (1971).