It is not an injury to an employee to sell the company's operations overseas and close shop in the US. Forseeable injury is applicable to negligence suits, and it is not negligent to change the business model resulting in the employee being out of work.
A company has no legal responsibility to maintain the livelihood of their employees at the cost of the business' profit margins.
Livelihood of employees is also a false start, unionization and the accompanying high wages are also a significant factor in the disparity between Western industry and China.
A company has no legal responsibility to maintain the livelihood of their employees at the cost of the business' profit margins.