I'm not aware of any "resistance groups" fighting the Nazis that created horrors of this kind - though the Soviet army itself probably did. In my opinion, what

I'm not aware of any "resistance groups" fighting the Nazis that created horrors of this kind - though the Soviet army itself probably did. In my opinion, what distinguishes these kinds of massacres is their utter meaninglessness; they serve no military purpose, they are usually even detrimental to military goals. Going door to door killing does nothing to advance a cause - it is purely an expression of hate.