Mastro Plastics Corp. v. National Labor Relations Board

350 U.S. 270 · Decided February 27, 1956 · Supreme Court of the United States

At a glance

Mastro Plastics Corp. v. National Labor Relations Board was decided on February 27, 1956 by a vote of 6–3. The Court affirmed the lower court's decision. Justice Harold H. Burton wrote the opinion of the Court. SCDB classifies its main issue as “Labor-management no-strike clauses” in the Unions area.

Read the opinion

• CourtListener (Free Law Project) — opinion text
• Library of Congress — official U.S. Reports scan

Case details

How the Justices voted

Full case caption

Mastro Plastics Corp. et al. v. National Labor Relations Board

SCDB identifiers: case 1955-026, docket 1955-026-01.

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Cases on the same legal provision: National Labor Relations Act

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Same Term, same area (Unions)

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• National Labor Relations Board v. Cocacola Bottling Co. of Louisville, Inc.
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  350 U.S. 299Decided February 27, 19568–0Tom C. Clark
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Source: Supreme Court Database, 2026 Release 01 (data file dated September 8, 2026). Imported into CaseTrail November 5, 2026. Coverage: decisions from the 1946 through 2025 Terms. Methodology · Report an error