Maryland Code, Labor and Employment § 4-106

(1) conduct an investigation;

(2) hold hearings;

(3) administer oaths; and

(4) issue a subpoena for the attendance of a witness to testify or the production of books, papers, and other documents.

(b)(1) If a person fails to comply with a subpoena issued under this section, on petition of the Mediation Service or board, a circuit court may compel compliance with the subpoena.

(2) A board shall petition the circuit court for the county where the board is meeting.