Introduction to Jews: About 90% of the victims in the concentration camps were Jews from various European countries. Hans Frank, one of the leaders of Nazi Germany at the time, once said, “The Jews are a race that should be completely exterminated. " Such thoughts will inevitably lead to the mass extermination of the Jews. In addition, Gypsies, prisoners of war, intellectuals, resistance organization members, " Anti-social elements, Jehovah's Witnesses and homosexuals were also imprisoned here.