© Reuters/Yves Herman A protester wearing a Guy Fawkes mask, symbolic of the hacktivist group "Anonymous", takes part in a protest in central Brussels January 28, 2012.
UK: London - In turning one of its best-known hackers into an informant and breaking open the highest profile elements of the "Anonymous" movement, authorities have dealt a serious blow to a group they found a growing irritant.
But as the broader "Anonymous" label - complete with its iconic Guy Fawkes mask imagery - is used by ever more disparate causes worldwide, it may be all but impossible to shut it down for good.
U.S. authorities revealed on Wednesday that leading Anonymous hacker "Sabu" - real name Hector Xavier Monsegur, aged 28 - had been arrested last June in his apartment in a Manhattan housing complex.
According to a newly released court transcript, he agreed to cooperate with authorities in return for likely leniency - helping U.S. prosecutors bring charges against five more men, including two in Britain and two in Ireland. All had also been previously arrested.
"Sabu was seen as a leader," said Mikko Hypponen, chief research officer of Finnish security firm f-secure. "Just yesterday people were looking up to him... it's a very serious blow. It's probably not going to be the end of Anonymous but it's going to take a while for them to recover, particularly from the paranoia."
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