National Security Agency National Security Agency

Director of National Intelligence James Clapper (center), accompanied by FBI Director Robert Mueller (left) and CIA Director John Brennan, testifies on Capitol Hill on March 12, 2013. When questioned, Clapper said the NSA did not collect data on Americans. He later acknowledged his response was "clearly erroneous." Susan Walsh/AP hide caption

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Susan Walsh/AP

The Challenge Of Keeping Tabs On The NSA's Secretive Work

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Over the last dozen years, whistleblowers at the National Security Agency have had a rough track record, facing FBI raids and lawsuits. NSA/Reuters/Landov hide caption

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NSA/Reuters/Landov

Before Snowden: The Whistleblowers Who Tried To Lift The Veil

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Speaker John Boehner prepares to speak to the media after the House passed the USA Freedom Act, an NSA reform bill aimed at restricting access to Americans' phone records. Jim Lo Scalzo/EPA/Landov hide caption

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Jim Lo Scalzo/EPA/Landov

Glenn Greenwald in April, arriving in the U.S. for the first time since documents were disclosed to him by former intelligence analyst Edward Snowden. Stan Honda/AFP/Getty Images hide caption

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Stan Honda/AFP/Getty Images

Glenn Greenwald: NSA Believes It Should Be Able To Monitor All Communication

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