DETROIT—The United Auto Workers (UAW) is challenging the big capitalist-driven trade policies that have gutted American manufacturing and wrecked working-class communities across the country. In a new white paper, “Trade and the American Dream: NAFTA, the USMCA, and the Future of the Working Class,” the union lays out its indictment of “free trade” policies and proposes an alternative: “NAFTA and the like are the social contract as written by mu…