By Glenn Greenwald, star of Citizenfour, the Academy Award-winning documentary on Edward Snowden In May 2013, Glenn Greenwald set out for Hong Kong to meet an anonymous source who claimed to have astonishing evidence of pervasive government spying and insisted on communicating only through heavily encrypted channels. That source turned out to be the twenty-nine-year-old NSA contractor Edward Snowden, and his revelations about the agency's widespread, systemic overreach proved to be some of the most…
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