Benjamin B. Ferencz, the last surviving prosecutor of the Nuremberg trials, who convicted Nazi war criminals of organizing the murder of a million people, and German industrialists of using slave labor to build Hitler’s war machine, died on April 7 in Boynton Beach, FL. He was 103.

Thirteen trials were held in Nuremberg. Mr. Ferencz was assigned to prosecute the Einsatzgruppen case, which for its staggering volume of victims has been called the biggest murder trial in history. It was the case against 22 Nazis, including six generals, who organized, directed and often joined roaming SS extermination squads, aided by police and other authorities, who rounded up and slaughtered a million specifically targeted people or groups in Nazi-occupied lands: political and cultural leaders, members of the nobility, clergy, teachers, Jews, Gypsies and others. Most were shot, others gassed in mobile vans. Fourteen were sentenced to death and two to life in prison.

Later, he taught at Pace University, wrote several books, and was the subject of a 2019 documentary. He gave $1 million to the Holocaust Memorial Museum in Washington, The New York Times said.