Mich. Comp. Laws § 750.265a

Sec. 265a. Any person who counterfeits or imitates any union label, or who uses any union label without authority of the particular labor organization or association of working-men whose union label is being so used, shall be guilty of a misdemeanor. A union label for the purposes of this section is defined as a trademark, term, design, symbol or device of a labor organization or association of working-men adopted by them to distinguish their craft, trade or work or membership in or indicating work done by such labor organization or association of working-men.