5 ILCS 430/15-5
In this Article:
"Public body" means (1) any officer, member, or State agency; (2) the federal government; (3) any local law enforcement agency or prosecutorial office; (4) any federal or State judiciary, grand or petit jury, law enforcement agency, or prosecutorial office; and (5) any officer, employee, department, agency, or other division of any of the foregoing.
"Supervisor" means an officer, a member, or a State employee who has the authority to direct and control the work performance of a State employee or who has authority to take corrective action regarding any violation of a law, rule, or regulation of which the State employee complains.
"Retaliatory action" means the reprimand, discharge, suspension, demotion, denial of promotion or transfer , or change in the terms or conditions of employment of any State employee , that is taken in retaliation for a State employee's involvement in protected activity, as set forth in Section 15-10.
5 ILCS 430/15-5