The guy, Hal, who is rich but never works and may own the nightclub they visit or just be a good customer, gets into it with some bikers. Very quickly things escalate to rape and mass murder. This movie is really a two-fer as it is not only shockingly violent but shockingly inept and the story not shockingly makes little sense. There are no Mad Foxes in it that i'm aware of. There IS a great soundtrack featuring some very early british heavy metal and cheesy porno type horns and synthesizer.
Mad Foxes also features an AMAZING car. I'm not into cars at all but the main characters Stingray truly is the coolest thing I've ever seen and it's featured quite prominently.
http://www.youtube.com/watch?v=_PBaY6VLFbA