Of course Katharine Gun was free to have a conscience, as long as it didn't interfere with her work at a British intelligence agency. To the authorities, practically speaking, a conscience was apt to be less tangible than a pixel on a computer screen. But suddenly -- one routine morning, while she was scrolling through e-mail at her desk -- conscience struck. It changed Katharine Gun's life, and it changed history.
Despite the nationality of this young Englishwoman, her story is...
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