The only reasonable thing that the National Labor Relations Board can do in this situation is to assure that the employees in Washington will remain to have their jobs in their state, while the other factory that is installed in SC, would have their workers in that state to be equally represented by the International Association of Machinists and Aerospace Workers.
Sad to see that the Republicans like Joe Wilson had resorted to manipulating a SC Boeing employee in order to present a "human face" in front of the committee.
If I was the head of the International Association of Machinists and Aerospace Workers in Washington State, I would do my best to infiltrate inside the plant in SC. This is the only way where Unions can combat these interstate tactics used by Corporations such as Boeing here. They have to simply follow them to wherever they go.