c. 266, § 69
Insignia of societies; unlawful use
Official text prohibited actmental stateif conditionpenaltylegal term
Whoever, not being a member of a society, association or labor union, for the purpose of representing that he is a member thereof, wilfully wears or uses the insignia, ribbon, badge, rosette, button or emblem thereof, if it has been registered in the office of the state secretary, shall be punished by a fine of not more than twenty dollars or by imprisonment for not more than one month, or both.
Simplified explanation
A non-member who wilfully wears or uses a registered society, association or labor union insignia to pose as a member faces up to one month in prison, a $20 fine, or both.