Megaupload.com was shut down by the U.S Justice Department on January 19, 2012, during an investigation of charges regarding copyright infringement, conspiracies to commit racketeering, and money laundering.
Federal prosecutors have accused the site of costing copyright holders more than $500 million in lost revenue.
Two co-founders of Megaupload, Kim Dotcom and Mathias Ortmann were arrested in Auckland, New Zealand, along with two other employees. The firm (Megaupload) says it was diligent in responding to complaints about pirated material.
Moreover, a federal court in Virginia ordered that 18 domain names associated with the firm must be seized also.
Anonymous didn’t feel too happy with the Department of Justice’s move to shut down MegaUpload, and in a response to this the hackers targeted the FBI and US Department of Justice (DOJ) websites by blocking them. Hackers also attacked the sites of RIAA (Recording Industry Association of America), MPAA (Motion Picture Association of America), and Universal Music, with a message “more to come”.