Mich. Comp. Laws § 423.241

Sec. 11. Where an employee organization recognized pursuant to Act No. 336 of the Public Acts of 1947, as amended, as the bargaining representative of employees subject to this act, willfully disobeys a lawful order of enforcement by a circuit court pursuant to section 10, or willfully encourages or offers resistance to such order, whether by a strike or otherwise, the punishment for each day that such contempt persists, may be a fine fixed in the discretion of the court in an amount not to exceed $250.00 per day. Where an employer, as that term is defined by Act No. 336 of the Public Acts of 1947, as amended, willfully disobeys a lawful order of enforcement by the circuit court or willfully encourages or offers resistance to such order, the punishment for each day that such contempt persists may be a fine, fixed at the discretion of the court, an amount not to exceed $250.00 per day to be assessed against the employer.