“Student warning! Do your homework early. Wikipedia protesting bad law on Wednesday!” Wales said on the microblogging site.
“‘Freedom is never voluntarily given by the oppressor; it must be demanded by the oppressed.’ MLK – on Wednesday, Wikipedia demands,” Wales said, citing slain US civil rights leader Martin Luther King.
The Stop Online Piracy Act (SOPA) is currently before the House of Representatives, while the Protect IP Act is the version before the Senate.
The draft legislation has won the backing of Hollywood, the music industry, the Business Software Alliance, the National Association of Manufacturers and the US Chamber of Commerce.
But last month, the founders of Google, Twitter, Wikipedia, Yahoo! and other Internet giants expressed concern over the two drafts, saying in an open letter that they would “give the US government the power to censor the Web using techniques similar to those used by China, Malaysia and Iran.”