Mich. Comp. Laws § 750.154

Sec. 154. Violation by corporation forfeits charter—Any corporation now or hereafter organized under the laws of this state, which shall enter into any contract, agreement, understanding or combination declared illegal and criminal by the first section of this chapter, or shall do any act towards or for the purpose of carrying the same into effect in whole or in part, and which shall not within 30 days from the time when this chapter shall take effect, withdraw its assent thereto and repudiate the same and file in the office of the secretary of state such refusal and repudiation under its corporate seal, shall forfeit its charter and all its rights and franchises thereunder.