The United Auto Workers union said on Friday that 97 percent of its members had voted to authorize strikes against General Motors, Ford Motor and Stellantis if the union and companies were unable to negotiate new labor contracts.The result gives the union’s president, Shawn Fain, the power to tell workers to walk off the job once the current contracts expire on Sept. 14.Strike authorization votes are normally formalities that pass by significant margins and do not ensure strikes. But this vote comes at a moment when the newly energized U.A.W. takes a more assertive stance with automakers, part of a larger shift in organized labor.G.M., Ford and Stellantis have posted strong profits for about a decade. That has emboldened Mr. Fain and his members to call for s …
