Any person who shall wilfully resist, prevent, impede or interfere with the Commission, its members, agents or agencies in the performance of duties pursuant to this act, or shall wilfully violate an order of the Commission, shall be guilty of a misdemeanor and, upon conviction thereof, shall be sentenced to pay a fine of not less than one hundred dollars ($100.00) nor more than five hundred dollars ($500.00), or to undergo imprisonment not exceeding thirty (30) days, or both, in the discretion of the court, but procedure for the review of an order shall not be deemed to be such wilful conduct.