Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 147, § 27

No licensee shall enter, or cause any person to enter, any place of employment for any purpose having to do with the organizing or organization of employees in said establishment, or any purpose having to do with hours of labor, wages or salaries paid, or conditions of employment in such establishment or its branches or subsidiaries or related units, or to disseminate propaganda of any sort among employees in such establishment, or to be concerned with labor conditions of employees as a group, nor shall any licensee or agent or employee of a licensee pose as an employee in any such establishment for any of the aforementioned purposes.

Violation of any provision of this section shall be cause for the suspension of such license for not less than one year, after a public hearing by the colonel of the state police, on written complaint of any aggrieved person, or the officer of any aggrieved labor union or association, whether incorporated or otherwise.