Sabu

• 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.
(msnbc.com)
• Monitored in real time by the FBI, 28-year-old New Yorker Hector Xavier Monsegur, aka Sabu, has been secretly working for the government for months.
(Computerworld)
• Im pissed off, the notorious hacker Sabu told me on the phone last September, lamenting the latest arrests in a worldwide crackdown on the hacking collective Anonymous. Im getting real sad, with all the bullshit.
(Gawker)
• This post has been corrected. See the note at the bottom for details. It took one simple mistake for Hector Xavier Monsegur, a hacker who goes by the name Sabu, to get caught by the FBI.
(Los Angeles Times)
• Hector Xavier Monsegur, the traitorous leader of hacker group LulzSec, may have turned over five of his fellow hackers to the Federal Bureau of Investigation — but that doesn't mean he's getting off easy.
(YAHOO!)
• LulzSec mastermind Sabu was identified today as 28-year-old Hector Monsegur, who has been working with the FBI since being arrested last summer and pleaded guilty to computer hacking crimes.
(Ars Technica)
• Computerworld - In a major break for law enforcement, several members of the LulzSec and Anonymous hacking groups were arrested this morning based on information provided by Sabu, the shadowy LulzSec leader who was secretly arrested last year.
(Computerworld)
• The most prominent and revered member of Anonymous, Sabu, has reportedly been an FBI informant for months. And thanks to his help, authorities today rounded up the last members of LulzSec, the notorious defunct hacking group he once led,.
(Gawker)