The U.S. government has unsealed an indictment against 13 alleged members of the loose-knit hacker organization Anonymous, for attempts to take down websites operated by MasterCard, Visa, Bank of America, the Motion Picture Association of America, and others.

Those Distributed Denial of Service (DDoS) attacks were made as part of a campaign that Anonymous called Operation Payback, which ran from September 2010 until early 2011.

Visa and MasterCard were said to have been included because they had ceased processing payments to Wikileaks, the controversial online publisher of confidential and top secret files from government agencies and corporations.

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