CERTIORARI TO THE SUPERIOR COURT OF MASSACHUSETTS. No. 33. Argued November 10, 1955. Decided January 9, 1956. An interstate railroad which engaged in hauling loaded truck-trailers "piggy-back" brought an action in a state court to enjoin a labor union from conduct which interfered with such operation and which allegedly violated the Labor Management Relations Act. Employees of motor carriers with which the union had collective bargaining agreements had been persuaded by agents of the union to refrain