Illinois Statutes Chapter 820. Employment § 154/20. Unlawful employer practices

§ 20. Unlawful employer practices. It is unlawful for any employer to take any adverse action against an employee because the employee (1) exercises rights or attempts to exercise rights under this Act, (2) opposes practices which such employee believes to be in violation of this Act, or (3) supports the exercise of rights of another under this Act.

Exercising rights under this Act includes filing an action or instituting or causing to be instituted any proceeding under or related to this Act; providing or agreeing to provide any information in connection with any inquiry or proceeding relating to any right provided under this Act; or testifying to or agreeing to testify in any inquiry or proceeding relating to any right provided under this Act.