Maryland Labor and Employment Section 4-313

      (a)      A court may not grant injunctive relief in a labor dispute:

            (1)      if the plaintiff has failed to comply with each obligation imposed by law that is involved in the labor dispute; or

            (2)      except as provided in subsection (b) of this section, if the plaintiff has failed to make every reasonable effort to settle the labor dispute:

                  (i)      by negotiation; or

                  (ii)      with the help of available dispute resolution mechanisms, governmental mediation, or voluntary arbitration.

      (b)      If irreparable injury is threatened, a court may grant injunctive relief before another tribunal acts to settle the labor dispute.