It shall be unlawful for any member of the Commission to charge, receive, or obtain, directly or indirectly, any fee, commission, retainer or brokerage other than established salaries to be fixed by the Commission, and no member of the Commission shall have any interest in any land, materials, commissions or contracts sold to or made with the Commission, or with any member thereof.  Violation of any provisions of this section shall be a Class 2 misdemeanor. (1961, c. 158; 1977, c. 741, ss. 7, 8; 1993, c. 539, s. 1037; 1994, Ex. Sess., c. 24, s. 14(c).)