The U.S. Supreme Court on March 19 heard arguments in a case challenging a 2000 California law that prohibits state contractors and other companies that receive more than $10,000 from the state from using those funds "to assist, promote, or deter union organizing."

In its own party brief filed with the court, the National Chamber Litigation Center, the U.S. Chamber's public policy law firm, argued that California's law unlawfully restricts employers' statutory right under the National Labor Relations Act to communicate freely with employees concerning the pros and cons of union organizing.