From a Washington Post obit by Emily Langer headlined “Ben Ferencz, last living Nuremberg prosecutor, dies at 103”:

Ben Ferencz was a 27-year-old lawyer with no courtroom experience when he prosecuted what would be called the largest murder case in history. Standing 5-foot-2, he nearly disappeared behind the lectern in the packed courtroom in Nuremberg, Germany, in 1947.

Mr. Ferencz, a Transylvanian-born Jew who had arrived in the United States as an infant, presented to a U.S. tribunal the massive case against 22 authorities of the mobile Nazi killing units, called Einsatzgruppen, that operated in Eastern Europe during World War II.