Maryland Code, Public Utilities § 18-214

(1) form, join, or assist any employee organization;

(2) bargain collectively through the representative that they have chosen;

(3) engage in other lawful concerted activities for the purpose of collective bargaining; and

(4) refrain from any activity covered under this paragraph.

(c)(1) An employee who is a member of a bargaining unit with an exclusive representative may discuss any matter with the General Manager of the Commission or the General Manager's designee.

(2) The Commission may not alter any terms or conditions of employment that are subject to collective bargaining under § 18-207 of this subtitle without following the process for collective bargaining under this subtitle.