I know that the Algerians where included in the Hornec gang, which consists of both French gypsies and Algerians. They were very powerful, but I think their power has declined a bit. In Marseille there also were a lot of Algerian gangsters active like Farhid Berrhama and Saïd Tir, but they mostly cooperate with the Corsicans and Italians.
It looks like in Paris nowadays the most active crews are some Russian groups, Triads, Tamil gangs, some Albanian crews and then the characters from the French 'milieu' ( mostly French Gypsies along with Algerians).
Hells Angels are said to be pretty big in Bretagne.