More details, photos and names are at the Daily Mail item
"Sabu", has been working for the FBI since the middle of 2011. Sabu is Hector Xavier Monsegur, an unemployed 28-year-old Puerto Rican living in New York, who pleaded guilty to carrying out online attacks against PayPal and Mastercard, according to documents unsealed in a Manhattan court on Tuesday. The charges were filed via a "criminal information" form, which means that he has been cooperating with the government.
There were two men from Great Britain and two from Ireland - and one member of larger group Anonymous - an American named Jeremy Hammond from Chicago. Jeremy Hammond was arrested on charges of hacking and device access fraud.
The other members were identified by sources as Ryan Ackroyd and Jake Davis of London, and Darren Martyn and Donncha O’Cearrbhail of Ireland. They are all suspected members of LulzSec. Nicknames
Hector Xavier Monsegur used the name "Sabu"
Ryan Ackroyd was known as "kayla", "lol" and "lolspoon".
Darren Martyn as "pwnsauce", "raepsauce" and networkkitten",
Donncha O'cearrbhail, goes by the name "palladium",
Jeremy Hammond, was known as "Anarchaos", "sup_g", "burn", "yohoho", "POW", "tylerknowsthis", and "crediblethreat."
English teenager Ryan Cleary was arrested by British law enforcement in June and charged with being linked to the group.