A group of workers at Volkswagen AG's plant in Chattanooga, Tenn., is organizing a petition drive to counter the United Auto Workers union in its attempt to organize the German auto maker's sole U.S. factory.

The UAW said earlier this month that it had collected signed union cards from more than half of the plant's 2,000 production workers and has had talks with the company's top management in Germany about becoming the official representative of the plant's assembly workers.

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