Seventy years ago, Allied troops invaded Germany and liberated Nazi death camps. They found unspeakable horrors which still haunt the world's conscience. Frontline presents the world broadcast of a 1945 film made by British and American film crews who were with the troops liberating the camps. The film was directed in part by Alfred Hitchcock and was broadcast for the first time in its entirety on FRONTLINE.

The day after Martin Luther King, Jr. was killed, a teacher in a small town in Iowa tried a daring classroom experiment. She decided to treat children with blue eyes as superior to children with brown eyes. FRONTLINE explores what those children learned about discrimination and how it still affects them today.