He's the worst Nazi war criminal you've never heard of. Sidekick to SS Chief Heinrich Himmler and supervisor of Nazi rocket scientist Wernher von Braun, General Hans Kammler was responsible for the construction of Hitler's slave labor sites and concentration camps. He personally altered the design of Auschwitz to increase crowding, ensuring that epidemic diseases would complement the work of the gas chambers. Why has the world forgotten this monster?...

Frontline investigates the secret history of the unprecedented surveillance program that began in the wake of September 11th and continues today. As big technology companies encouraged users to share more and more information about their lives, they created a trove of data that could be useful not simply to advertisers, but also to the government. The revelations of NSA contractor Edward Snowden would push Silicon Valley into the center of a debate...