When did they realise Edward Snowden was the real deal? | The Edward Snowden story

Guardian.com editor-in-chief Janine Gibson and head of news Stuart Millar describe how they verified the Snowden story from London and the moment they knew they had something big.
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Gibson and Millar were joined by Alan Rusbridger and Ewen MacAskill at a Guardian Live preview of Citizenfour for members in Kings Place London on 2 March, 2015
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