Stellantis is suing the United Auto Workers, escalating a monthslong battle between the transatlantic automaker and American union, CNBC has learned.

Automaker Stellantis has filed a lawsuit against the United Auto Workers in federal court in California, claiming the union's actions around possible strikes illegal. The carmaker will seek to hold the UAW and the local union chapter liable for the revenue loss and other damages resulting from lost production due to any strike.

The United Auto Workers union said on Friday that members at Stellantis' Los Angeles parts distribution center voted in favor of authorizing a strike if the carmaker failed to settle grievances with the union over investments in the U.

Is Eustace Tilley about to hit the picket line? The union representing editorial workers at the New Yorker, the storied Condé Nast-owned magazine, on Thursday announced its members had unanimously voted to authorize a strike against the employer as they seek a new deal.

More than six months into negotiations over a second labor contract, the magazine's union is asserting that wage floors, layoff protections and guardrails on outside work remain major sticking points.

The union representing hundreds of New Yorker editors and fact-checkers voted overwhelmingly this week to authorize a strike as contract negotiations continue.