Anonymous Sabu was working for FBI to Trace down other LulzSec hackers. Arrests were part of a multinational sting across the United Kingdom, Ireland and the United States. Police on two continents swooped on top members of computer hacking group Lulzsec early today. Five members of the hacking collective were arrested or hit with additional charges today. The Identity of Sabu is doxed as: Hector Xavier Monsegur, aka “Sabu,” who operated online under the alias ” Sabu,” is unclear what his fate is now.
Source: https://thehackernews.com/2012/03/anonymous-sabu-was-working-for-fbi-to.html