Md. Code, Criminal Law § 9–707

This subtitle does not impair, curtail, or destroy the rights of employees and their representatives to:

(1) self-organization;

(2) form, join, or assist labor organizations;

(3) bargain collectively through representatives of their own choosing; and

(4) strike, picket, or engage in concerted activities for the purpose of collective bargaining or other mutual aid or protection.