WASHINGTON — In 2006, when Edward J. Snowden joined the thousands of
computer virtuosos going to work for America’s spy agencies, there were
no recent examples of insiders going public as dissidents. But as his
doubts about his work for the Central Intelligence Agency and then for the National Security Agency
grew, the Obama administration’s campaign against leaks served up one
case after another of disillusioned employees refashioning themselves as
heroic whistle-blowers.