Maryland Labor and Employment Section 4-314
§ 4-314.
  In addition to any other limitation under this Part III of this subtitle, a court may not issue a temporary or permanent injunction in a case that involves or grows out of a labor dispute unless:
    (1)   each known person against whom relief is sought and each public officer who has a duty to protect the property of the plaintiff is given, in the manner that the court directs, personal notice that the court will hold a hearing on issuance of a temporary or permanent injunction;
    (2)   at the hearing, the court takes, in open court, testimony offered against the temporary or permanent injunction and affords the opportunity for cross-examination; and
    (3)   as a result of the hearing, the court finds that:
      (i)   an unlawful act:
        1.   has been threatened and, unless restrained, will be committed; or
        2.   has been committed and, unless restrained, will be continued;
      (ii)   unless it grants the relief requested, the property of the plaintiff will be injured substantially and irreparably;
      (iii)   greater injury will be inflicted on the plaintiff for each item of relief that the court denies than will be inflicted on the defendant if the court grants the item;
      (iv)   it is not granting any item of relief for which a court lacks jurisdiction under § 4-307 of this subtitle;
      (v)   the plaintiff has no adequate remedy at law; and
      (vi)   each public officer who has a duty to protect the property of the plaintiff has failed or is unable to give adequate protection.