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

Decided February 27, 1956. Harold Hitz Burton delivered the opinion of the Court.

Docket 19 · 350 U.S. 270 (1956) · Cited 594 times

We don’t yet publish a summary of this opinion — read the official text below for the Court’s holding and reasoning.

How the Justices voted

Decided 6–3.

“Concurring” means agreeing with the outcome; any split shown is the Court’s judgment, not each Justice’s reasoning. Source: the Supreme Court Database (Spaeth et al.), Washington University.

Precedents cited

Supreme Court decisions this opinion relies on, ordered by how often it cites each. Cases in our collection link through; others are named.

• National Labor Relations Board v. International Rice Milling Co. · 341 U.S. 665 (1951)
• United States v. American Trucking Associations · 310 U.S. 534 (1940)
• Phelps Dodge Corp. v. National Labor Relations Board · 313 U.S. 177 (1941)
• Schwegmann Bros. v. Calvert Distillers Corp. · 341 U.S. 384 (1951)
• Allen Bradley Co. v. Local Union No. 3, International Brotherhood of Electrical Workers · 325 U.S. 797 (1945)
• National Labor Relations Board v. Fansteel Metallurgical Corp. · 306 U.S. 240 (1939)
• United States v. Heirs of Boisdoré · 49 U.S. 113 (1849)
• Boston Sand and Gravel Co. v. United States · 278 U.S. 41 (1928)
• Southern Steamship Co. v. National Labor Relations Board · 316 U.S. 31 (1942)
• National Labor Relations Board v. Sands Manufacturing Co. · 306 U.S. 332 (1939)
• Duparquet Huot & Moneuse Co. v. Evans · 297 U.S. 216 (1936)

Cited by

Later Supreme Court opinions in our collection that cite this case.

• National Woodwork Manufacturers Ass'n v. National Labor Relations Board · 386 U.S. 612 (1967)
• National Labor Relations Board v. Lion Oil Co. · 352 U.S. 282 (1957)
• Belknap, Inc. v. Hale · 463 U.S. 491 (1983)
• National Labor Relations Board v. C & C Plywood Corp. · 385 U.S. 421 (1967)
• National Labor Relations Board v. Magnavox Co. of Tennessee · 415 U.S. 322 (1974)
• National Labor Relations Board v. Bildisco & Bildisco · 465 U.S. 513 (1984)
• Metropolitan Edison Co. v. National Labor Relations Board · 460 U.S. 693 (1983)
• Adickes v. S. H. Kress & Co. · 398 U.S. 144 (1970)
• Pilot Life Insurance v. Dedeaux · 481 U.S. 41 (1987)
• Alexander v. Gardner-Denver Co. · 415 U.S. 36 (1974)
• Briscoe v. LaHue · 460 U.S. 325 (1983)
• Richards v. United States · 369 U.S. 1 (1962)
• Mississippi Band of Choctaw Indians v. Holyfield · 490 U.S. 30 (1989)
• Kelly v. Robinson · 479 U.S. 36 (1986)
• Boys Markets, Inc. v. Retail Clerks Union, Local 770 · 398 U.S. 235 (1970)
• Atkinson v. Sinclair Refining Co. · 370 U.S. 238 (1962)
• Allied Chemical & Alkali Workers of America, Local Union No. 1 v. Pittsburgh Plate Glass Co. · 404 U.S. 157 (1971)
• Golden State Bottling Co. v. National Labor Relations Board · 414 U.S. 168 (1973)
• Offshore Logistics, Inc. v. Tallentire · 477 U.S. 207 (1986)
• National Labor Relations Board v. Great Dane Trailers, Inc. · 388 U.S. 26 (1967)
• Wright v. Universal Maritime Service Corp. · 525 U.S. 70 (1998)
• National Labor Relations Board v. Allis-Chalmers Manufacturing Co. · 388 U.S. 175 (1967)
• Local Lodge No. 1424, International Ass'n of MacHinists v. National Labor Relations Board · 362 U.S. 411 (1960)
• Drake Bakeries Inc. v. Local 50, American Bakery & Confectionery Workers International · 370 U.S. 254 (1962)
• National Labor Relations Board v. Fleetwood Trailer Co. · 389 U.S. 375 (1967)
• National Labor Relations Board v. Fruit & Vegetable Packers & Warehousemen, Local 760 · 377 U.S. 58 (1964)
• National Labor Relations Board v. J. H. Rutter-Rex Manufacturing Co. · 396 U.S. 258 (1969)
• National Labor Relations Board v. City Disposal Systems, Inc. · 465 U.S. 822 (1984)
• Commissioner v. Engle · 464 U.S. 206 (1984)
• United States v. Calamaro · 354 U.S. 351 (1957)

Official text

Read the official opinion (U.S. Reports, govinfo.gov)

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Source: the U.S. Reports via govinfo.gov; authoring Justice and vote lineup from the Supreme Court Database (Washington University). Citation count from the Free Law Project’s CourtListener bulk data. Data last verified 2026-07-03. Informational only; verify against the primary source before relying. Not a consumer report (FCRA).