When National Security Agency whistleblower Edward Snowden reached out to Laura Poitras in January 2013, the documentary filmmaker knew just what to do: Make a documentary.
She had recently won a MacArthur "Genius Grant" in 2012 and was already several years into making a film about surveillance in the post-9/11 era when Snowden contacted her under the name "citizen four."
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When she and Glenn Greenwald flew to Hong Kong in June 2013, she brought her camera with her. The result is a film unlike anything done before. Its world premiere is at the New York Film Festival Friday and will be in theaters Oct. 24.