Sorry but the problem with this kind of thougt is that is like: wow now the CP had won and they will live happily ever after...unfortunaley this is a world war and is not possible, as even OTL victors demonstrated that the war produced great political and social scar and basically begin the downfall of their empire, the CP will not be different as Germany will face internal political problem as the old leaderships will be considered cause of the slaughter of entire generations of Germans, will must continue to prop up much of the new east european state, control the polish and continue to enforce limitations to the French armed forces if for some miracle is victory had permitted that and in this case even controlling the colonies.
Shaken but not broken. In interwar Britain there were a couple of Labour governments, but both were short-lived minority ones. France didn't swing left either. And Germany, of course, even after losing the war, soon turned to Hindenburg as President.
The only major victor power to have any kind of revolution was Italy, and significantly that one was from the right rather than the left. I doubt if the CPs would be much different.