30 ILCS 545/1
Whenever the General Assembly shall pass any enactment for the construction or repair or any public work or improvement, of the state, of any character or name whatsoever, and the said enactment, shall have become a law, and plans, specifications and estimates for the construction or repair of said public work or improvement have been submitted to and approved by the authorities designated in said law, and an appropriation has been made to defray the estimated expense thereof; any person or persons, commissioner or commissioners, or other officer or officers, entrusted with the execution of said public work or improvement, who shall so change, alter or modify, or permit or connive at such change, alteration or modification by any person or persons under his or their direction or control, directly or indirectly, so as to incur a greater cost and expense in the construction or repair of such public work or improvement, than was specified by the law authorizing it, and the appropriation made in pursuance thereof, shall be deemed guilty of a Class A misdemeanor.
30 ILCS 545/1