820 ILCS 96/1-20: Reporting of allegations.

No contract, agreement, clause, covenant, waiver, or other document shall prohibit, prevent, or otherwise restrict an employee, prospective employee, or former employee from (1) reporting any allegations of unlawful conduct to federal, State, or local officials for investigation, including, but not limited to, alleged criminal conduct or unlawful employment practices, or (2) engaging in concerted activity to address work-related issues.