Compiled Laws, Chapter 750. Michigan Penal Code § 750.556

Sec. 556. Any employer of labor in this state, employing both males and females, who shall discriminate in any way in the payment of wages as between sexes who are similarly employed, shall be guilty of a misdemeanor. No female shall be assigned any task disproportionate to her strength, nor shall she be employed in any place detrimental to her morals, her health or her potential capacity for motherhood. Any difference in wage rates based upon a factor other than sex shall not violate this section.