The United Auto Workers union has accused Volkswagen (VLKAY) of neglecting a labor board order that directed the company to negotiate with members of its Local 42 in Chattanooga, Tenn., the Detroit News reports.

Volkswagen is accused of ignoring a 2016 ruling from the National Labor Relations Board which authorized a 2015 election that resulted in workers at Volkswagen's Chattanooga plant voting to unionize, UAW secretary-treasurer Gary Casteel said.

"For months, Volkswagen has used every stall tactic available to avoid recognizing workers' right to form a union and negotiate a contract," Casteel said in an email to UAW members urging them to sign a petition today.

"Sign the petition now and tell Volkswagen to put an end to the stall tactics," Casteel continued.

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Volkswagen is appealing the labor relations board's decision to the U.S. Court of Appeals for the D.C. Circuit. 

Shares of Volkswagen were lower during the final hour of trading on Wednesday.

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