Illinois Code § 2

§ 2.

Whenever a collective bargaining agreement or contract between any employer or any association of employers and any association or union of employees for performance of personal service requires that employees, members of an association or union party to such agreement, engaged in its personal performance shall be paid a stipulated minimum rate of wages, it shall be unlawful for any person, either for himself or any other person to request, demand, persuade, induce or attempt to induce any such worker or employee, either before or after such worker or employee is engaged, to pay back, return, donate, contribute or give any part or all of said worker's or employee's wages, salary, or thing of value to the employer, his agents or representative, or any person acting for the employer or to receive or accept from such worker or employee, or any person acting for him, any part or all of such worker's or employee's wages or salary as a refund, gift or donation. (Source: P.A. 81-992.)