Laura Poitras is the director of Oscar-winning documentary Citizenfour, which tells the story of National Security Agency whistleblower Edward Snowden. Mr. Snowden fled the U.S. for Hong Kong in June 2013, where he first met Ms. Poitras in a hotel room, where some of the movie is filmed.

Ms. Poitras was in Hong Kong recently to attend screening of Citizenfour, where she also met with audiences. The following interview has been edited.

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