An employee can sue the employer for discrimination based on race, sex, age, disability or religion.
If the employee believes that the demotions are due to some discriminatory purpose, that employee can file a complaint with the EEOC (www.eeoc.gov).
Essentially, yes. If you don't have a contract guaranteeing you employment for a certain period of time with certain duties, those can be taken away by the employer.
If you're an at will employee, you're really not guaranteed anything with regard to employment.
An employer can terminate an employee for any reason or for no reason at all SO LONG AS IT IS NOT DISCRIMINATORY.
If you can rely on some grounds of discrimination, you could file a complaint. Otherwise, there are not many legal grounds for you to sue on.
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