Boeing’s South Carolina Mechanics Reject Union in Blow to Labor

Boeing Co. employees in South Carolina voted overwhelmingly against unionization, dealing a blow to the embattled labor movement’s efforts to expand its ranks under President Donald Trump.

The vote is a loss for the International Association of Machinists and Aerospace Workers but not a surprise in a right-to-work state traditionally hostile to collective bargaining. It comes two days ahead of the factory rollout of the largest 787 Dreamliner, Boeing’s marquee carbon-fiber jet, an event the president is expected to attend.

The labor defeat is the latest in a long-running struggle between Boeing’s management and the Machinists’ union, with the South Carolina plant ...