@nprofile1q... My mother had a family member who survived the camps. He returned home to Austria to reclaim his home & business. The people who were there murdered him rather than give it back.
The Holocaust deniers can't claim the witnesses are lying, e.g., US & Allied military who liberated the camps. Only God knows for sure how many were murdered including the atrocities committed in Russia. Entire towns & villages were murdered, homes burned, & bulldozed.