According to the FBI, you're looking at Sabu, the head of LulzSec, and the de facto King of Anonymous—easily the most notorious and influential hacker alive today. One thing: he just turned in his people to the police.
The name Sabu should be familiar: as part of LulzSec, a potent offshoot of Anonymous, he masterminded legendary attacks against the CIA, FBI, Sony, and numerous other corporate and government targets. He was their Captain Hook. That was before. Fox News reports the shadowy hack deity is not only confirmed to be 28-year-old New Yorker Hector Xavier Monsegur, but that Sabu has been "collaborating with the government for months," leading to a string of arrests around the world today. It's unclear how many will be dragged down with Sabu's nine months of federal collaborating, but it's safe to assume whatever vestiges of LulzSec remained are toast—we'll know for sure when all of the indictments are unsealed.