It shall be unlawful for any member of the authority or any employee thereof to charge, receive or obtain, either directly or indirectly, any fee, commission, retainer or brokerage out of the funds of the authority, and no member of the authority or officer or employee thereof shall have any interest in any land, materials or contracts sold to or made or negotiated with the authority or with any member or employee thereof acting in his capacity as a member or employee of such authority. Violation of any provision of this section shall be a misdemeanor and, upon conviction, shall be punishable by removal from membership or employment and by a fine of not less than $100.00 or by imprisonment not to exceed six months, or both.