It became a running joke among U.S. officials that Bart Gellman should watch his back. In May 2014, I appeared on a panel alongside Robert Mueller, the former FBI director, to talk about Snowden. Mueller cross-examined me: Were the NSA documents not lawfully classified? Were they not stolen? Did I not publish them anyway? I held out my arms toward him, wrists together, as if for handcuffs. The audience laughed.