Then there were Bandera's boys, who murdered over 100,000 Poles.
I'm currently reading a fascinating book about the half and quarter Jews who served in the Wehrmacht under Hitler in WWII. The book is based on research conducted by the author for his academic thesis. He traveled to Germany, spent a large swathe of time there, went through archival material, tracked down as many survivors of the war as he could so he could interview them, and view the documents in their possession. The book is well-documented up the yin-yang. No one would ever think that a Jew of any percentage would have even wanted to serve under Hitler, but they did, because the majority of them, didn't see themselves as Jews. They believed they were true Germans.
Hitler stripped everyone who wasn't a full-blooded Aryan, of their German citizenship, and he had declared that when it came to recognizing the Mischling (mixed blood), that served in his military, that he wasn't going to make a determination on whether they would be granted full citizenship until after the war ended. Here you had at least 150,000 half and quarter Jews fighting for Germany, and they weren't even considered German citizens. Personally, I believe that Hitler would have eliminated all of them if Germany had won. His belief was that any person who had any percentage of Jewish blood in them was tainted, and in order to fully purify the Aryan race, those people would have to be killed off, so they couldn't procreate, and continue to weaken the Aryan race. The author has a second book out on the same topic. It's an expansion of the lives of men who served.