Workers assemble Volkswagen Passat sedans at the German automaker's plant in Chattanooga, Tenn., on June 12, 2013. The automaker announced a new policy Wednesday that would allow interaction with labor unions at the plant. Erik Schelzig/AP hide caption

itoggle caption Erik Schelzig/AP

Volkswagen's car plant in Chattanooga, Tenn., is the company's only one in the U.S. Its employees voted this week on whether to join the United Auto Workers union. Volkswagen hide caption

itoggle caption Volkswagen