Sad thing is the only ones who really fought the Nazis in France, were the Communists, and they almost succeeded in taking over France after the war.
Communists were executing their enemies, before DeGaulle came in and put a stop to it.
Hitler made several critical strategic mistakes, one of which was violating, breaking the Molotov–Ribbentrop Pact (peace and cooperation with the Soviet Union).
Nazis and Communists were, are very close brothers in crime.
It is much like two criminal gangs fighting over turf in Chicago. the two gangs are not only similar but they may even share family ties.