Nine giants of the Internet — Google, eBAy, AOL, Facebook, Yahoo, Zynga, LinkedIn, Mozilla and Twitter — have placed a full-page ad in today’s New York Times as part of their efforts to fight back against the “Stop Online Piracy Act” (SOPA) and the “PROTECT IP Act.”

These pieces of legislation, which have strong bipartisan support in Congress, as well as backing from the Motion Picture Association of America, a variety of Hollywood union organizations and even Master Card and Pfizer, would require companies and Internet service providers to block access to any website that the entertainment industry believes “engages in, enables or facilitates”copyright infringement. In essence, these bills, if they become law, would allow for broad Internet censorship. And companies like those listed above would be required by law to do the censoring.