Laura Poitras

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FILE - In this April 11, 2014 file photo, filmmaker Laura Poitras smiles after arriving at John F. Kennedy International Airport in New York. Poitras’ travel nightmare began a decade ago when the award-winning documentary filmmaker started getting detained at airports every time she tried to step foot back in the United States. She would be stopped without explanation more than 50 times on foreign trips and dozens of times during domestic travel. Only now is Poitras beginning to unravel the mystery, which starts on a bloody day in Baghdad in 2004. (AP Photo/John Minchillo, File)

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This April 16, 2014 photo shows Pulitzer Prize and Polk Award winner Laura Poitras in New York to promote her documentary film "1971," premiering Friday at the Tribeca Film Festival. (Photo by Charles Sykes/Invision/AP)

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This April 16, 2014 photo shows Pulitzer Prize and Polk Award winner Laura Poitras in New York to promote her documentary film "1971," premiering Friday at the Tribeca Film Festival. (Photo by Charles Sykes/Invision/AP)

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FILE - In this Friday, April 11, 2014, file photo, journalist Glenn Greenwald, left, listens as Laura Poitras speaks during a news conference following the Polk Awards luncheon, in New York. The Washington Post and The Guardian won the Pulitzer Prize in public service Monday, April 14, 2014, for revealing the U.S. government’s sweeping surveillance efforts in stories based on thousands of secret documents handed over by National Security Agency leaker Edward Snowden. The reports were published by Barton Gellman of The Post and Greenwald, Poitras and Ewan MacAskill of The Guardian, all of whom shared a George Polk Award for national security reporting. (AP Photo/Bebeto Matthews, File)

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Glenn Greenwald, left, and Laura Poitras arrive at at John F. Kennedy International Airport, Friday, April 11, 2014 in New York. Greenwald and Poitras share a George Polk Award for national security reporting with The Guardian's Ewen MacAskill and Barton Gellman, who has led The Washington Post's reporting on the NSA documents. (AP Photo/John Minchillo)

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Laura Poitras and Glenn Greenwald, two reporters central to revealing the massive U.S. government surveillance effort, and The Guardian's Ewen MacAskill pose for photos after they received the George Polk Award for National Security Reporting, at New York's Roosevelt Hotel, Friday, April 11, 2014. Poitras and Greenwald returned to the United States for the first time since the story broke to receive the journalism award. (AP Photo/Richard Drew)

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Laura Poitras, right, hugs David Michael Miranda after arriving at John F. Kennedy International Airport on Friday, April 11, 2014 in New York. Poitras and Glenn Greenwald share a George Polk Award for national security reporting with The Guardian's Ewen MacAskill and Barton Gellman, who has led The Washington Post's reporting on the NSA documents. (AP Photo/John Minchillo)

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Laura Poitras smiles after arriving at John F. Kennedy International Airport after arriving at John F. Kennedy International Airport on Friday, April 11, 2014 in New York. Poitras and Glenn Greenwald share a George Polk Award for national security reporting with The Guardian's Ewen MacAskill and Barton Gellman, who has led The Washington Post's reporting on the NSA documents. (AP Photo/John Minchillo)