Maryland Code, Labor and Employment § 4-301

(1) a permanent injunction;

(2) a temporary injunction; or

(3) a temporary restraining order.

(1) terms or conditions of employment;

(2) employment relations;

(3) the association or representation of persons in negotiating, setting, maintaining, or changing terms or conditions of employment; or

(4) any other controversy arising out of the respective interests of employee or employer.

(1) is engaged in the industry, craft, trade, or occupation in which the dispute occurs; or

(2) is an agent, member, or officer of an association of employees or employers engaged in the industry, craft, trade, or occupation in which the dispute occurs.