United Auto Workers union members at the Volvo Group-owned Mack Trucks facilities — including one in Hagerstown–went on strike yesterday. This action follows the union’s rejection of a tentative contract agreement. In a letter, UAW President Shawn Fain said a majority of workers voted against the deal, which included a 19-percent pay raise. The union represents roughly four-thousand workers in Pennsylvania, Maryland and Florida. This comes as thousands of UAW members across at least 20 states remain on strike against the Big Three U.S automakers.