Satan's Sadists (1969)

The "Satans" are a very cruel biker gang led by Anchor. The gang goes to a diner in the middle of nowhere in the California desert where they begin to terrorize Lew and his patrons and his waitress, Tracy. After a little killing, one of the patrons named Johnny manages to escape from the bikers into the desert. They need to reach a town before the Satans catch up to them and kill them.