Compiled Laws, Chapter 750. Michigan Penal Code § 750.523

Sec. 523.REFUSAL TO AID OFFICER TO DISPERSE OR ARREST RIOTERS--If any person present, being commanded by any of the magistrates or officers aforesaid, to aid and assist in seizing and securing such rioters, or persons so unlawfully assembled, or in suppressing such riot or unlawful assembly, shall refuse or neglect to obey such command, or when required by any such magistrate or officer to depart from the place of such riotous or unlawful assembly, shall refuse or neglect so to do, he shall be deemed to be 1 of the rioters or persons unlawfully assembled, and shall be liable to be prosecuted and punished accordingly.