Justice Blackmun, delivered the opinion of the Court.
The issue in this litigation is whether the National Labor Relations Act (NLRA), 49 Stat. 449, as amended, 29 U. S. C. § 151 et seq., pre-empts enforcement by a state authority, acting as the owner of a construction project, of an otherwise lawful prehire collective-bargaining agreement negotiated by private parties.
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