What follows is an opinion from the Supreme Court of the United States. Your task is to determine the issue of the Court's decision. Determine the issue of the case on the basis of the Court's own statements as to what the case is about. Focus on the subject matter of the controversy rather than its legal basis.

Opinion:
April 4, 1955.
No. 186.
General Drivers, Warehousemen, and Helpers, Local Union No. 89, et al. v. American Tobacco Co., Inc.
Argued March 31-April 1, 1955.
Decided April 4, 1955.
Herbert S. Thatcher and William S. Tyson argued the cause for petitioners.
J. Albert Woll, David Previant and Ralph H. Logan were with Mr. Thatcher on the brief.
By special leave of Court, Dominick L. Manoli argued the cause for the National Labor Relations Board, as amicus curiae, urging reversal.
With him on the brief were Solicitor General Sobeloff, David P. Findling and Norton J. Come.
Nelson Helm argued the cause for respondent. With him on the brief was Francis E. Koch.
Certiorari, 348 U. S. 813, to the Court of Appeals of Kentucky.
Per Curiam:
The judgment is reversed. Weber v. Anheuser-Busch, Inc., 348 U. S. 468; Bus Employees v. Wisconsin Board, 340 U. S. 383.

Question: What is the issue of the decision?

Choices:
federal-state ownership dispute (cf. Submerged Lands Act)
federal pre-emption of state court jurisdiction
federal pre-emption of state legislation or regulation. cf. state regulation of business. rarely involves union activity. Does not involve constitutional interpretation unless the Court says it does.
Submerged Lands Act (cf. federal-state ownership dispute)
national supremacy: commodities
national supremacy: intergovernmental tax immunity
national supremacy: marital and family relationships and property, including obligation of child support
national supremacy: natural resources (cf. natural resources - environmental protection)
national supremacy: pollution, air or water (cf. natural resources - environmental protection)
national supremacy: public utilities (cf. federal public utilities regulation)
national supremacy: state tax (cf. state tax)
national supremacy: miscellaneous
miscellaneous federalism

Answer: 1