Boeing's South Carolina workers will vote Wednesday on whether or not to unionize. The company initially established an assembly line in South Carolina in order to challenge union strategies in Seattle. The machinists cancelled a vote to unionize almost two years ago due to misinformation spread by the company's management. Currently, a local business group with which Boeing is associated is running anti-union commercials. Although the International Association of Machinists and Aerospace workers has expressed confidence in it's ability to win the vote to unionize, Boeing officials also claim that they will be able to counteract this push.
See "Union Vote at Boeing Plant Tests Labor's Sway Under Trump", Noam Scheiber and Christopher Drew, The New York Times, February 14, 2017