55 ILCS 5/3-14037

No officer or employee in said classified service, or named in Section 3-14022, shall discharge or degrade, or promote, or in any manner change the official rank or compensation of any other officer or employee, or promise or threaten to do so, for giving or withholding or neglecting to make any contribution of money, or other valuable thing, for any party or political purpose, or for refusal or neglect to render any part or political service.