Jews, Poles, Gypsies were all seen as not the superior race. The Nazi's started exterminating them in death camps like Dachau and Auschwitz. Some were solely concentration camps, like Bergen- Belsen. If you're wondering why they built it in Poland... is because Poland was completely ran by Nazi Germany since September 1939 ( the start of WWII). Poland was fairly far from the Allied armies. No western nation would end up liberating Poland since it was in the East. Only the Soviet Union, which was losing the war during the time the camps were being built. It wouldn't be till late 1944, early 1945 when Poland would be liberated by the Soviet Union.
