Just two years ago, Volkswagen was actively supporting the United Auto Workers in its push to organize the company’s plant in Chattanooga, Tenn. But in September, the German automaker was plunged into turmoil over revelations that it had equipped almost 600,000 diesel cars sold in the United States with software to cheat on tailpipe emissions tests. Since then, a large portion of Volkswagen’s senior management has changed — and so has its approach to the union drive. Now, rather than cooperating with the U.A.W., Volkswagen is trying to block the union. Read more Sections Labor News