Prob 8 10. No U.S. tire producers joined in the request for the tariff on tires in 2009. Rather, the petition for a tariff on tires imported from China was brought by the United Steelworkers of America, the union who represents workers in the tire industry. Why did major tire manufacturers operating in the United States, such as Goodyear, Michelin, Cooper, and Bridgestone, not support the tariff?