A group of labor union members who engaged in peaceful primary picketing within the confines of a privately owned shopping center were threatened by an agent of the owner with arrest for criminal trespass if they did not depart. The question presented is whether this threat violated the National Labor Relations Act, 49 Stat. 449, as amended, 61 Stat. 136, 29 U. S. C. § 151 et seq. The National Labor Relations Board concluded that it did, 205 N. L. R. B. 628, and the Court of Appeals for the Fifth Circuit agreed. 501 F. 2d 161. We granted certiorari because of the seemingly important questions of federal law presented. 420 U. S. 971.

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