Michigan Compiled Laws, Chapter 408. Labor § 408.939

Sec. 9. (1) If an employer violates this act, the employee affected by the violation, at any time within 3 years, may do any of the following:

(2) If the director determines there is reasonable cause to believe that the employer has violated this act and the director is subsequently unable to obtain voluntary compliance by the employer within a reasonable period of time, the director shall bring a civil action under subsection (1)(a). The director may investigate and file a civil action under subsection (1)(a) on behalf of all employees of that employer who are similarly situated at the same work site and who have not brought a civil action under subsection (1)(a). A contract or agreement between the employer and the employee or any acceptance of a lesser wage by the employee is not a bar to the action.

(3) Except as otherwise provided in subsection (4), in addition to bearing liability for civil remedies described in this section, an employer who fails to pay the minimum hourly wage in violation of this act, or that violates a provision of section 4a  1 governing an employee's compensatory time, is subject to a civil fine of not more than $1,000.00.

(4) An employer that fails to pay the minimum hourly wage to an employee as described in section 4d(1)  2 is subject to a civil fine of not more than $2,500.00.