(Reuters) – 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

The Federal Bureau of Investigation has arrested three alleged members of the hacker group Lulz Security, and charged two others with conspiracy to commit crimes. According to Fox News, which broke the story, the international takedown was made possible by none other than Hector Xavier Monsegur, better known as “Sabu,” the alleged leader of LulzSec.

A group of expert hackers who attacked governments and corporations around the globe have been arrested after its ringleader — one of the world's most-wanted computer vandals — turned against his comrades and secretly began working as an informant for the FBI months ago, authorities announced Tuesday.