United Automobile, Aircraft & Agricultural Implement Workers of America v. Wisconsin Employment Relations Board

Background

A national automobile and industrial union clashed with the Kohler Company when workers struck and mass-picketed the plant. The Wisconsin Employment Relations Board found the union had obstructed entrances, blocked public ways, threatened workers and their families, and prevented would-be employees from entering. The Board issued a detailed order limiting pickets and requiring open access; a state court enforced that order and the state supreme court affirmed.

Reasoning

The central question was whether a State can, through its labor law and a state labor board, stop violent or coercive picketing when the same acts might also be unfair labor practices under the federal National Labor Relations Act. The majority said yes. The Court relied on earlier cases, the language and history of the federal law, and congressional discussion showing that federal unfair labor rules do not strip States of their traditional power to prevent violence and protect public order. The Court therefore held Wisconsin could enjoin the violent conduct, even though the federal board might also have authority over unfair labor practices.

Real world impact

The decision lets state labor agencies and courts step in to stop violent or obstructive picketing and to set concrete limits, like caps on picket numbers and clear access lanes. Employers, striking workers, and nonstriking employees will face both state orders to preserve safety and the continuing reach of federal labor law for other unfair practices. The ruling leaves open the possibility of overlapping state and federal actions.

Dissents or concurrances

A three-Justice dissent warned this ruling duplicates federal administrative remedies, risks clashes between state and federal agencies, and departs from prior cases that barred such overlapping injunctions.