Mich. Comp. Laws § 750.524: Riotous or unlawful assembly; neglecting or refusing to suppress assembly and arrest offenders; penalty.

Sec. 524.

Any mayor, alderman, supervisor, president, trustee or member of a common council, sheriff, or deputy sheriff, having notice of any such riotous or tumultuous and unlawful assembly as is mentioned in this chapter, in the township, city, or village in which he or she lives, who shall neglect or refuse immediately to proceed to the place of such assembly, or as near as he or she can with safety, or shall omit or neglect to exercise the authority with which he or she is invested by this chapter, for suppressing such riotous or unlawful assembly, and for arresting and securing the offenders, is guilty of a misdemeanor punishable by imprisonment for not more than 6 months or a fine of not more than $750.00.