Well, allying with the Soviets was a necessary evil, since the Communists sent special forces troops behind German lines to identify, contact and liquidate partisan groups not clearly subordinate to Moscow to prevent the emergence of an anti-Communist nucleus to post-war resistance to Stalin’s rule.
It’s shocking, but the Soviets probably killed as many anti-Nazi partisans behind German lines as the Nazis.
We are perhaps over-concentrating on Poland, in vast swathes of occupied Soviet territory the “partisans” were often little more than gangs of brigands, frequently deserters from the Red Army, who lived off the land by robbing, murdering and pillage, after the Germans were defeated they could dress up their activities as “resistance” to the Nazis, it is not always the case that their victims would have agreed.
Any partisan who fought the Nazis on the other hand gets my full support and respect, my point is that it is usually best not to adopt simple black and white historical narratives towards situations that are often very shady and mixed up.