For more than half a century, Beate and Serge Klarsfeld have hunted, confronted, and exposed Nazi war criminals, tracking them to South America and the Middle East. As the duo reveals here, Beate's father was in the Wehrmacht, while Serge's father was deported to Auschwitz because he was a Jew. They have been targeted by letter bombs, and their car was blown up, yet nothing has daunted the Klarsfelds. Few original Nazis remain, but the Klarsfelds also work to oppose far-right extremists like perennial French political candidate Marine Le Pen.