Why did Nuremberg trials take place?

The leaders of Nazi Germany were terrible people. They orchestrated the murder of eleven million innocent people. So after the war, the Allies set up a trial. Most of the major leaders had already committed suicide. I believe twelve were executed. The others either were acquitted, were put in prison, or escaped to South America.

They put them on trial because they broke four different laws.

1.Conspiracy

2. War Crimes

3. Crimes against humanity

4. Membership in a criminal organization declared so by the International Military Tribunal. They declared the SS a criminal organization.