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The Court has consistently recognized the right of States to deal with violence and threats of violence appearing in labor disputes, sustaining a variety of remedial measures against the contention that state law was preempted by the passage of federal labor legislation. Allen-Bradley Local v. Wisconsin Board, 315 U. S. 740; United Construction Workers v. Laburnum Construction Corp., 347 U. S. 656; United Automobile Workers v. Wisconsin Board, 351 U. S. 266; Youngdahl v. Rainfair, Inc., 355 U. S. 131; United Automobile Workers v. Russell, 356 U. S. 634. The permissible scope of state remedies in this area is strictly confined to the ...