Md. Code, Labor and Employment § 4–317

(a) A court may not grant injunctive relief in a case that involves or grows out of a labor dispute until the court makes and files, in the record of the case, findings of fact.

(b) Injunctive relief in a case that involves or grows out of a labor dispute shall prohibit an act only if:

(1) the complaint in the labor case expressly complains of the specific act; and

(2) the findings of fact expressly include the specific act.

(c) Injunctive relief in a case that involves or grows out of a labor dispute is binding only on a person:

(1) who receives, by personal service or otherwise, actual notice of the injunctive relief; and

(2) who is:

(i) a party to the case;

(ii) an agent or employee of a party or lawyer who represents a party; or

(iii) a person in active concert and participation with a party.