Evidence
The prosecutors built the case around personal and political writings of the Nazis. Germans documented everything, so when the Allied forces liberated the concentration camps and invaded Germany, they seized thousands of documents, photos, film, and propaganda documenting the public humiliation of Jews, their deportation, mass murder, and confinement in concentration camps. They also used Nazi propaganda that depicted torch-lit rallies, book burnings, and Adolf Hitler's speeches. They used photos and film German soldiers and police took of German operations against Jews. The prosecutors also used evidence from their own side, such as the graphic footage of the liberated concentration camps shot by Allied soldiers. They even went as far as to show a piece of tattooed skin and the shrunken head of a Polish worker used as a paperweight at the Buchenwald concentration camp.