A new and independent union won the right to represent workers at General Motors Co.’s truck plant in Mexico — a sign that new North American free trade rules are bolstering the nation’s labor rights.
The union, known as SINTTIA, won the vote by a wide margin, Mexican labor authorities said. The group defeated the CTM, Mexico’s entrenched labor group, to represent more than 6,000 workers in labor negotiations at the plant, which produces the Chevrolet Silverado and GMC Sierra models in Silao, a city in central Mexico.