Carlos Tavares, chief executive officer of Stellantis NV, speaks to the media at the Stellantis auto manufacturing plant in Sochaux, France, on Thursday, Oct. 3, 2024. DETROIT — Stellantis is suing the United Auto Workers, escalating a monthslong battle between the transatlantic automaker and American union, CNBC has learned. In an internal message Friday to employees that was confirmed to be authentic, the company said it is suing the UAW as well as a local chapter in California that participated in a stri ...