FILE - In this April 23, 2018, file photo, the logo for General Motors appears above a trading post on the floor of the New York Stock Exchange. The Canadian auto workers union is calling on people in Canada and the U.S. to stop buying General Motors vehicles made in Mexico. The Unifor union wants people to boycott vehicles with identification numbers that start with three. Unifor says it will publicize the boycott with television, newspaper and billboard ads. So far the United Auto Workers union in the U.S. is not joining the effort. (AP Photo/Richard Drew, File)
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