Their rage was further stoked when they discovered in Barr’s email account a document containing the real names and personal information of suspected Anonymous members, along with indications he was going to sell it to the FBI. According to our source, the hackers decided to confront Barr directly.
More: http://gawker.com/5753570/anonymous-hackers-pay-back-fbi-snitch-with-50000-leaked-emails