Even as he urged tens of thousands of Twitter followers to rise up and attack government and law enforcement, the most wanted hacker on the planet was working for the FBI. . New Yorker Hector Xavier Monsegur, 28, was exposed on Tuesday as the person behind Sabu, the colorful leader of Lulz Security, a much-feared and talented offshoot of the cyber-activist group Anonymous.. New Yorker Hector Xavier Monsegur, 28, was exposed on Tuesday as the person behind Sabu, the colorfu. urged, thousands, twitter, followers, attack, government. . Dave Wreski
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