Prosecutors said Hammond hacked into more than half a dozen secure sites to cause what he called "maximum mayhem." His most high-profile hack came in December 2011 when he stole at least 200 gigabytes of confidential information from Stratfor, a private Texas intelligence firm. Thousands of employee emails were released to WikiLeaks and posted over a series of weeks, exposing a host of secret operations Stratfor was conducting, from tracking the Occupy movement on behalf of the U.S. government to corporate spying for heavyweights such as Dow Chemical Co. and Coca-Cola.