In the begininng of the movie when the motorcycle gang beats up a motorist, the three onlookers are Tom Laughlin's real life family. Delores Taylor (wife) Teresa Laughlin- a.k.a Teresa Kelly (daughter) and Frank Laughlin (son)
Tom Laughlin had been trying to get a script about discrimination against American Indians made since 1954. The trend of motorbike gang movies - mainly appearing in drive-ins - gave him the chance he had been seeking to resurrect the idea.
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.