Logan Valley Plaza, Inc., owned a large shopping center complex known as Logan Valley Mall near Altoona, Pennsylvania, at the intersection of Plank Road and Good's Lane. The center featured five entrance roads, extensive macadam parking lots, sidewalks, and driveways, all separated from the adjoining highways by earthen berms twelve to fifteen feet wide. At the time of the events, the mall was occupied by Weis Markets, Inc., which operated a supermarket consisting of an enclosed building, a covered porch, and a five-foot-wide parcel pickup zone, along with Sears, Roebuck and Co., which operated a department store and automobile service center.
Weis opened for business on December 8, 1965, employing a wholly nonunion staff. A few days later Weis posted a sign on the exterior of its building prohibiting trespassing or soliciting by anyone other than its employees on its porch or parking lot. Beginning December 17, 1965, members of Amalgamated Food Employees Union Local 590, all employees of Weis competitors rather than of Weis itself, began picketing the Weis store. They carried signs stating that Weis was nonunion and that its employees were not receiving union wages or other union benefits. Between four and thirteen pickets, averaging around six, conducted the activity almost entirely in the parcel pickup area and the immediately adjacent portion of the parking lot; the picketing remained peaceful at all times.
On December 27, 1965, Weis and Logan filed an equity action in the Court of Common Pleas of Blair County. The court immediately issued an ex parte order enjoining petitioners from picketing and trespassing upon the Weis storeroom, porch, and parcel pickup area as well as the Logan parking area and all entrances and exits. The order had the effect of confining all picketing to the berms beside the public roads outside the shopping center. Picketing continued along the berms, and handbills asking the public not to patronize Weis were also distributed.
After an evidentiary hearing that established the facts of the picketing, the Court of Common Pleas continued the original ex parte injunction indefinitely. The trial court rejected petitioners' First Amendment claim and alternatively based the injunction on both property rights and an unlawful purpose. On appeal the Pennsylvania Supreme Court affirmed the issuance of the injunction on the sole ground that petitioners' conduct constituted a trespass on respondents' property. The United States Supreme Court granted certiorari.
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