Hi there!
Not to preclude further discussion, but our own /u/commiespaceinvader has written extensively on this topic in the past, as have a number of other contributors. As they explain in the following answers, "the Wehrmacht as an institution as well as on the level of individual commanders was heavily involved in war crimes, atrocities, and the Holocaust."
You can find a number of /u/Commiespaceinvader's relevant answers below:
You may also be interested in our FAQ section on the Holocaust and Nazi War Crimes.