The Black Dragon Gang was the biggest gang in french history (more than 900 members at their peak) they ruled from the mid-80s to the early 90s, as a french version of the Black Panthers, and their goal was to kick out the racist / fascist skinheads out of Paris, much like the Red Warriors & all the antifa thing, except that BDG were an all-black gang (in the film, the only white guy in the gang will tell you the story of how he got in) their turf was mostly La Defense / Nanterre area of Paris, but also Chatelet, and pretty much every station on the RER A train line. as they made this docu themselves, they wont tell you that they were also sometimes considered a racist / anti-white gang...to sum it up, white guys (no matter how they dress) were pretty much supposed to avoid hanging around La Defense at night when BDG were around...