The answer is:
The Nuremberg Trials
The trials were held in the city of Nuremberg, Germany, from 1945 to 1946, at the Palace of Justice.
The first and best known of these trials was the Trial of the Major War Criminals before the International Military Tribunal (IMT), which tried 22 of the most important captured leaders of Nazi Germany. It was held from 21 November 1945, to 1 October 1946.