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By Lindsay Dunsmuir and Jim Finkle WASHINGTON/BOSTON (Reuters) - Two Vietnamese citizens and a Canadian have been charged with running a massive cyber fraud ring that stole 1 billion email addresses, then sent spam offering knockoff software products, the U.S. Department of Justice said on Friday. Court documents did not identify the email companies that were victimized, though the Justice Department described the hacking spree as "one of the largest" data breaches uncovered in U.S. history. Viet Quoc Nguyen, 28, is charged with hacking at least eight email service providers between February 2009 and June 2012. The government alleges that Nguyen and Giang Hoang Vu, 25, both Vietnamese citizens, used the stolen email addresses to identify tens of millions of people who they targeted in a spam campaign.