In November 1945 the first major war crimes trials in history opened in the German city of Nuremberg. Witness talks to the only surviving American prosecutor at the trials, Benjamin Ferencz, who helped unearth evidence of mass murder by the Nazi mobile death squads and prosecuted them.

(Photo: Chief prosecutor Benjamin Ferencz presents evidence during the Einsatzgruppen (death squads) trial. Ferencz is flanked by German lawyers for two of the defendants. Credit: US Holocaust Memorial Museum, courtesy of Benjamin Ferencz)