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Thanks to Edward Snowden's leaking of American intelligence secrets the whole world now knows the extent of US-UK surveillance of global phone and internet traffic. Have the revelations flagged up a corrosive infringement of individual liberty, or undermined efforts to protect the world from terrorism? HARDtalk speaks to journalist, Glenn Greenwald - he broke the Snowden story. His mission, he says, is to hold power to account. Is this a journalistic crusade that's gone too far?