Mich. Comp. Laws § 454.51
That any association of trades unions in this state, actually existing and conducting its operations under a constitution or articles of association, may become a body corporate and politic for the general purposes contemplated by Act No. 188 of the Public Acts of 1857, as amended, being sections 454.1 to 454.11 of the Michigan Compiled Laws, upon filing a copy of their constitution, or articles of association, verified by the oath of 1 or more of the executive officers of such association, in the corporation and securities bureau of the department of commerce. All such associations becoming corporations as above provided, shall be subject to the provisions of Act No. 188 of the Public Acts of 1857, as amended, except as otherwise in this act provided.
MCL 454.51