Preska oversaw the criminal case against Hector Xavier Monsegur ("Sabu"), a computer hacker who assisted Anonymous and others in cyberattacks targeting credit card companies, various governments, and media outlets. Monsegur became a government informant immediately after his arrest in early 2011, and pleaded guilty in August 2011 to twelve counts of hacking, fraud, and identity theft. In 2014, Preska sentenced Monsegur to time served (seven months in jail) and a $1,200 fine; federal prosecutors requested, and Preska granted, the lenient sentence due to Monsegur's "extraordinary" cooperation with the government. Information from Monsegur helped lead the authorities to at least eight co-conspirators, including Jeremy Hammond, and helped to stymie at least 300 cyberattacks. Hammond pleaded guilty in 2013 to hacking the private intelligence firm Stratfor, and Preska sentenced him to the maximum 10 years.