International Longshoremen's Ass'n, Local 1416 v. Ariadne Shipping Co.

Background

A local longshore union in Miami picketed two cruise ships that flew foreign flags when the ships docked at Port Everglades and Miami. The union protested that the American longshore workers who did casual loading and stowage work were paid wages below local standards. State courts in Florida issued and then sustained an injunction that barred picketing that alleged the ships paid substandard wages.

Reasoning

The central question was whether the National Labor Relations Act, a federal labor law, prevents state courts from stopping peaceful picketing of foreign-flag vessels when American longshoremen are involved. The Court explained that these American dockworkers were hired as longshoremen on U.S. docks, not as part of the ships’ crews, so their wage dispute did not touch the ships’ internal affairs governed by foreign law. The Court found those longshore activities to be part of commerce and therefore potentially subject to the National Labor Relations Board (NLRB). Under the Court’s prior rule, state courts must defer when activity is “arguably” covered by the federal labor law, so the Florida injunction could not stand and was reversed.

Real world impact

The ruling shifts authority to the NLRB to decide whether such picketing is protected or not and limits state courts’ ability to enjoin similar peaceful protests. The majority did not rule on the union’s separate free-speech claim because it was unnecessary once federal coverage was found. Employers and unions in port settings should expect disputes over wages at docks to be resolved under federal labor processes rather than by state injunctions.

Dissents or concurrances

A concurring opinion agreed with reversal but argued the Court should require that activity be actually, not just arguably, protected before blocking state action, noting employers lack an easy path to obtain NLRB rulings.