Maryland Code, Public Utilities § 18-202

(a) The Commission shall recognize the right of an employee organization, certified under this subtitle as the exclusive representative of a bargaining unit, to represent the employees of the bargaining unit in collective bargaining and in the settlement of grievances.

(b) An employee organization certified as the exclusive representative of a bargaining unit shall:

(c) An employee organization meets the requirements of subsection (b)(2) of this section if the employee organization's actions with respect to employees who are members of the employee organization and employees who are not members of the employee organization are not arbitrary, discriminatory, or in bad faith.