WW2: Spies & Ties S01E32 - What the Fuchs?

In the New Mexico desert, a secret team of scientists is working flat out to develop atomic bombs. It's the most important American military project in history. But one of those scientists lives a double life. Klaus Fuchs has decided to betray his country and share America's most secret technology with the Soviet Union. But is he the only person who has turned traitor?