John Kiriakou knows a lot about leaking classified information. He went to prison for it. A former CIA agent who said too much about the Bush-era torture program, he’s also the first CIA leaker to go to jail for his trouble. Kiriakou served just under two years in federal prison, though before the Department of Justice offered a plea deal, it seemed more likely he’d serve as many as 45. History has frowned on the “enhanced interrogation techniques” Kiriakou helped expose, but he’s still a controversial guy. Leakers usually are. They operate in gray areas. Kiriakou isn’t a cheering squad for...