Since the end of World War II, historians and psychologists have investigated the factors that motivated Germans to become Nazis before and during the war. While most studies have focused on the high-level figures who were tried at Nuremberg, much less is known about the hundreds of SS members, party functionaries, and intelligence agents who quietly navigated the transition to postwar life and successfully assimilated into a changed society after the war ended.

In A Nazi Past, German and American scholars examine the lives and careers of men like Hans Globke -- who not only...