After Volkswagen ignored bargaining requests from 160 skilled trades workers in their Chattanooga plant, the National Labor Relations Board filed an official complaint. The tradesmen are represented by the United Auto Workers, after another NLRB decision earlier this month sanctioned the union election and upheld its appointment of the UAW. This would be the UAW’s first successful organization of a foreign automaker in the South.
See "Labor agency files complaint against VW on row with UAW in Tennessee", Bernie Woodall and Daniel Wiessner, Reuters, April 28, 2016