The governments of the German Empire and Nazi Germany (under Adolf Hitler) ordered, organized, and condoned a substantial number of war crimes, first in the Herero and Nama genocide and then in the First and Second World Wars. The most notable of these is the Holocaust, in which millions of European Jews were systematically abused, deported, and murdered, along with Romani in the Romani Holocaust and non-Jewish Poles. Millions of civilians and prisoners of war also died as a result of German abuses, mistreatment, and deliberate starvation policies in those two conflicts. Much of the evidence was deliberately destroyed by the perpetrators, such as in Sonderaktion 1005, in an attempt to conceal their crimes.