In protest of a pending anti-piracy measure currently before the U.S. Congress, the hacker group “Anonymous” has posted personal information about two of the most powerful men in media, Time Warner Chief Executive Jeffrey L. Bewkes and Sumner M. Redstone, head of Viacom and CBS.

In an action it calls “Operation Hiroshima”, the “hacktivist” group has declared all-out war on the media and government figures it holds responsible for the Stop Online Piracy Act (SOPA), according to the New York Times‘s “Media Decoder” blog.

SOPA and its Senate companion bill, called the “Protect I.P. Act” (PIPA) aim to stop online piracy of copyrighted materials like movies, T.V. shows, and video games by granting private companies and the government greater authority to shut down websites both within the U.S. and abroad. Activists and Internet professionals argue that the bills give outside agencies too much control over Internet content and could result in censorship and the erosion of free speech.