Hanna Mining Co. v. District 2, Marine Engineers Beneficial Ass'n

Background

A group of corporations that operate Great Lakes cargo ships (called Hanna here) faced picketing by a marine engineers’ union (MEBA) after contract talks. Some licensed engineers had signed petitions saying they did not want MEBA to represent them. MEBA picketed ships at Duluth and later at Superior, Wisconsin. Hanna sought relief from the National Labor Relations Board and filed several charges, but the Board and its General Counsel treated the engineers as supervisors and declined to pursue complaints. Hanna then sued in Wisconsin state court for an injunction; the state courts dismissed the suit, fearing federal labor law might preempt their action.

Reasoning

The Court addressed whether the National Labor Relations Act (NLRA) prevented the State from stopping the picketing. The Justices held that the Board’s finding that the engineers were supervisors meant the picketing was not clearly protected or prohibited by the NLRA, so the usual federal preemption rules did not block state regulation. The Court also gave weight to the General Counsel’s explanatory letters and found the risk of interfering with federal labor policy to be minimal on these facts. The Supreme Court reversed the Wisconsin decision and sent the case back for further proceedings consistent with this opinion.

Real world impact

The ruling means state courts may consider enjoining union picketing that seeks to force recognition of supervisor unions when the Board has determined those workers are supervisors and federal law does not plainly govern the activity. The decision is limited to these factual circumstances and does not eliminate federal oversight where the NLRA clearly applies.

Dissents or concurrances

Justice Brennan concurred, agreeing states may regulate the primary aspects of such picketing and stressing the distinction between primary and secondary picketing in evaluating preemption.