Based on a real incident in 1964 when members of the Hell's Angels motorcycle gang were arrested for raping five girls in Monterey, California.
Tom Laughlin used the pseudonym T.C. Frank for his director's credit. The name stands for his three children, Frank, Teresa, and Christina
When Billy is locked up after the brawl at the start of the movie, his jailer is played by the same actor who locks up John Rambo at the start of First Blood.
Banned in Sweden for its violence in 1968, 1972 and 1975.
A self-financed film, Tom Laughlin ran out of money during post-production. He showed a working print to his contacts at American International Pictures (a company noted for its exploitation fare) and they agreed to give him the $300,000 he needed to complete the film.
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