William Binney describes how his former agency has built a massive system to track, monitor and record phone and Internet communications of U.S. citizens and people around the world. Binney resigned from the National Security Agency in 2001 to protest growing domestic surveillance. He was a senior NSA crypto-mathematician largely responsible for automating the agency’s worldwide eavesdropping network. He was one of the two co-founders of the agency’s Signals Intelligence Automation Research Center. He resigned after the Sept. 11 attacks.