The head labor official on Daimler AG's supervisory board says he considers it "unacceptable" that the German automaker's Mercedes plant in Alabama stands alone among the company's factories around the world without union representation for its workers. Michael Brecht, who took over as head of Daimler's works councils and as deputy chairman of the board in April, said in a phone interview with The Associated Press on Tuesday that he supports the United Auto Workers' efforts to gain recognition at the plant located near Tuscaloosa.