Hackers claim responsibility for attacks on U.S. Department of Justice, RIAA, Universal Music sites. Attack comes in retaliation for government’s removal of Megaupload.com. U.N. authorities removed the site on Thursday, and seven people were charged with running an organized criminal enterprise. The FBI website was on its target list, but that site remained operational midday on the West Coast. The action happened just a day after thousands of websites went dark in protest of Internet piracy bills before Congress.”]