CERTIORARI TO THE SUPREME COURT OF WISCONSIN. No. 396. Argued March 26, 1959. Decided May 4, 1959. A county, a general contractor and a plumbing contractor sued in a State Court to enjoin picketing by a plumbers' union, because of the employment of nonunion plumbers, which had stopped work on an addition to the county courthouse, about half of the total cost of which was the cost of materials brought from outside the State. Held: The controversy was exclusively within the jurisdiction of the National