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 from concentration camps to build Hitler’s war machine, died on Friday at an assisted living facility in Boynton Beach, Fla. He was 103. His son, Don, confirmed the death. A Harvard-educated New York lawyer whose concept of evil was formed when he was a Jewish soldier in Europe and a war-crimes investigator at Buchenwald, Mauthausen and Dachau, Mr. Ferencz (pronounced fer-RENZ) campaigned after World War II for restitution of...