(Reuters) - The United Auto Workers union said on Friday that members at Stellantis' ( STLA ) 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.S.

Stellantis ( STLA ) did not immediately respond to a request for comment.

The vote is the first of what is expected to be several such votes as the union seeks to apply pressure on Stellantis ( STLA ).

UAW President Shawn Fain last month accused Stellantis ( STLA ) of breaking its promises and said several of its union local chapters were laying the groundwork for strikes. In a letter last week, Fain urged workers to authorize a strike.

The union's grievances center around the company's product and investment commitments made during the contract negotiations last autumn, which Stellantis ( STLA ) has denied failing to honor.