Md. Code Ann., Lab. & Empl. § 4-310
(1) persons who are engaged in a single industry, trade, craft, or occupation, employees of the same employer, or members of the same or an affiliated organization of employees or employers, regardless of whether the dispute is between:
A case shall be held to involve or grow out of a labor dispute when the case involves:
Added by Acts 1991, c. 8, § 2, eff. Oct. 1, 1991.
Formerly Art. 100, § 74.