To kill millions of people on this scale, you needed an entire apparatus. And hundreds of thousands, if not millions of people, were involved in some way. And at least several hundreds of thousands of people within Germany must have been aware of what was happening. Needless to say, the death toll was considerable. This here is a visual depiction of the percentage of the Jewish population that was killed in various regions. And as you can see, 80 to 90% of the Jewish population in Germany, Czechoslovakia, Poland, was killed during the Holocaust. In the territories occupied by Germany in Russia during World War II, almost as many have been killed.