Workers at Mercedes-Benz’s largest U.S. plant have filed multiple federal charges with the National Labor Relations Board over allegations that the German company is using aggressive and illegal union-busting. tactics Workers are requesting an injunction to put an end to the company’s retaliation against workers In February, Mercedes workers announced that a majority of their coworkers at the Mercedes plant in Vance had signed union authorization cards. Every Mercedes plant in the world is unionized—except the company’s two plants in the United States. The powerful German automotive trade union IG Metall has thus far not publicly commented.