Hacktivist Hector Xavier Monsegur, aka Sabu, was one of the leaders of the popular group of hacktivists LulzSec that breached many high profile targets during in the last years, including Sony Pictures (2011). The group also claimed responsibility for taking down many other notorious targets such as AT&T, Viacom, Disney, Disney and The Sun, PayPal, MasterCard, The Times and the CIA. The New York time published the news that an FBI informant, Hector Xavier. Monseur, aka Monseurs, coordinated in 2012 a campaign of cyberattacks on foreign websites.”]
Source: https://securityaffairs.co/wordpress/24318/hacking/us-government-sabu-hacktivist.html