Massive popular opposition to the Stop Online Piracy Act (SOPA), which establishes a new censorship regime across websites in the United States, is set to turn broad swathes of the Internet black on Wednesday, with over 7,000 websites poised to shut down in protest of the bill.

The unexpected level of public criticism has taken Congress entirely by surprise, and has officials scrambling to revise the bill just enough to get the major Internet companies it threatens to stop their public opposition. Despite that, experts say a compromise is “unlikely” since the level of censorship sought by certain industries is so massive.