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/ Source: Associated Press

Federal prosecutors in New York say an admitted computer hacker helped the FBI thwart hundreds of cyberattacks on government and corporate computer systems.

The prosecutors also credit Hector Xavier Monsegur with helping cripple the group of so-called hacktivists known as Anonymous. They've asked a judge to reward him with a light sentence Tuesday.

Activists supporting the group Anonymous wear masks. U.S. prosecutors credit Hector Xavier Monsegur with helping to cripple Anonymous.AFP - Getty Images file

Monsegur, also known by his Internet alias Sabu, once led an Anonymous splinter group that stole information from Fox television, Nintendo and other businesses. Prosecutors say when FBI agents showed up at his Manhattan home in 2011, he immediately agreed to cooperate in a widespread hacking investigation.

Prosecutors say the Anonymous movement vilified Monsegur on the Internet for his cooperation. The threats became so severe he had to relocate.

— The Associated Press