There had been concentration camps in France as early as WWI. But as soon as 1939, the existing camps were undiscriminately filled with German anti-Nazis (Communists, German Jews, etc.) or pro-Nazi Germans or also Nazi prisoners of war. Following the 1940 defeat, and the July 10, 1940 vote of full powers to Marshall Pétain, who abolished the Republic on the following day and proclaimed the regime of the "French state" (aka Vichy regime), these camps would be filled with Jews, first with foreign Jews, then indifferently with foreign and French Jews. The Vichy government would progressively hand them up to the Gestapo, and they would all transit by Drancy internment camp, the last stop before concentration camps in the Third Reich and in Eastern Europe and the extermination camps.
Beside Jews, Germans and Austrians were immediately rounded-up in camps, as well as Spanish refugees, who were later deported. 5,000 Spaniards thus died in Mauthausen concentration camp [8]. The French colonial soldiers were interned by the Germans on French territory, instead of being deported [8].
The Third Republic and the Vichy regime would successively call these places "reception camps" ("camps d'accueil"), "internment camps" ("camps d'internement"), "sojourn camps" ("camps de séjour"), "guarded sojourn camps" ("camps de séjour surveillés"), "prisoner camps" ("camps de prisonniers"), etc. Another category was invented by Pétain's regime: the "transit camps" ("camps de transit"), referring by that the detainees were to be deported to Germany. Such "transit camps" include Drancy, Pithiviers, etc.
During the 1943 "Battle of Marseille" and urban scaping operations in the center of town, 20,000 people were expelled from their homes and interned during several months in military camps nearby Fréjus (La Lègue, Caïs and Puget) [9].
There were no extermination camps in France. However, the camp of Struthof, or Natzweiler-Struthof, in Alsace, which is the only concentration camp created by Nazis on French territory (annexed by the Third Reich) did include a gas chamber which was use to exterminate at least 86 detainees (mostly Jewish) in the aim of constituting a collection of preserved skeletons (as this mode of execution did no damage to the skeletons themselves) for the use of Nazi professor August Hirt.