That was a prominent sentence in Julian Assange's statement on the Bradley Manning verdict.
ProPublica has a breakdown of that history—who was accused of leaking defense information to whom and when. Here's the preamble:
Despite promises to strengthen protections for whistleblowers, the Obama administration has launched an aggressive crackdown on government employees who have leaked national security information to the press.
With charges filed against NSA leaker Edward Snowden this June, the administration has brought a total of seven cases under the Espionage Act, which dates from World War I and criminalizes disclosing information “relating to the national defense.” Prior to the current administration, there had been only three known cases resulting in indictments in which the Espionage Act was used to prosecute government officials for leaks.
The administration has also targeted journalists. In May, it was revealed that the Department of Justice had secretly seized AP reporters’ phone records while investigating a potential CIA leak, and targeted a Fox News reporter as part of a criminal leak case (outlined below). No journalist has been charged with a crime. But the news prompted an outcry that Obama’s hard line on leaks could have a "chilling effect" on investigative reporting that depends on inside sources.
The timeline begins with the Pentagon Papers in 1971.
Thanks to Slog tipper Greg.