Here is an interesting documentary that was recently released.
It’s official topic is the development of youth gangs as a response to the apparition of (nazi) skinhead gangs in Paris, in the 80′s. In my opinion, its main interest remains the documents more than the personal views and anecdotes expressed in it, for they often sound a bit too romanticized to be taken as such. Worth checking in any case!

(I only embed here the first part, I let you check out the rest directly from youtube…)