On this day in 1979, Josef Mengele—the Angel of Death of Auschwitz—died quietly in Brazil. Justice never caught him. And the world didn’t know the truth for another six years. After I published MENGELE, his son Rolf agreed to appear with me on live American television. The Mengele family had protected the fugitive Nazi for decades. “I would never betray my father,” Rolf said defiantly on that show. Below is a one-minute clip from that extraordinary exchange. | Gerald Posner