In 2013, twenty-nine-year-old Edward Snowden shocked the world when he broke with the American intelligence establishment and revealed that the United States government was secretly pursuing the means to collect every single phone call, text message and email. The result would be an unprecedented system of mass surveillance with the ability to pry into the private lives of every person on earth. Now, Snowden reveals for the first time how he helped to build this system and why he was moved...