Maryland Code, Land Use § 16-214

(1) interfere with, coerce, or restrain an employee in the exercise of the employee's rights under this subtitle;

(2) dominate, interfere with, or assist in the formation, administration, or existence of an employee organization or contribute financial assistance or other support to an employee organization;

(3) encourage or discourage membership in an employee organization by discriminating against the employee through hiring, tenure, promotion or demotion, or other conditions of employment;

(4) discharge or discriminate against an employee because the employee has signed or filed an affidavit, petition, or complaint or given any information or testimony under this subtitle; or

(5) refuse to bargain in good faith with an employee organization that is certified as the exclusive representative of a bargaining unit over any subject of bargaining or refuse to participate in good faith in the mediation, fact-finding, or grievance procedure under this subtitle.