The smell of mold hit James “Lucky” Dugan the moment he walked into the plant. Last fall, Dugan was one of thousands of union construction workers to arrive in small-town Glendale, Kentucky, to build a vast factory for Ford and SK On, a South Korean company. The plant, when completed, will make batteries for nearly a million electric pickup trucks each year. When Dugan walked in, huge wooden boxes containing battery-making machines, largely shipped from overseas, were laid across the mile-long f...