International Union of United Automobile, Etc. Workers of America, C. I. O. v. O'Brien
339 U.S. 454 · Decided May 8, 1950 · Supreme Court of the United States
At a glance
International Union of United Automobile, Etc. Workers of America, C. I. O. v. O'Brien was decided on May 8, 1950 unanimously (9–0). The Court reversed the lower court's decision. Chief Justice Fred M. Vinson wrote the opinion of the Court. SCDB classifies its main issue as “Federal preemption of state legislation or regulation” in the Federalism area.
Read the opinion
Case details
- Citations
- 339 U.S. 454 · 70 S. Ct. 781 · 94 L. Ed. 2d 978 · 1950 U.S. LEXIS 2531
- Docket number
- 456
- Decided
- May 8, 1950
- Argued
- March 30, 1950
- Court era
- Vinson Court
- Decision type
- Opinion of the Court (orally argued)
- Disposition
- Reversed
- Outcome for petitioner
- The petitioning party received a favorable disposition
- Vote
- 9–0 (unanimous)
- Majority opinion
- Fred M. Vinson
- Opinion assigned by
- Fred M. Vinson
- How the case arrived
- Appeal
- Issue area
- Federalism
- Legal provision
- Labor-Management Relations Act
- Type of law
- Federal statute
- Decision direction (SCDB)
- Liberal what this means
How the Justices voted
| Justice | Vote | Separate writing |
|---|---|---|
| Justice Hugo L. Black | Majority | |
| Justice Stanley F. Reed | Majority | |
| Justice Felix Frankfurter | Majority | |
| Justice William O. Douglas | Special concurrence | |
| Justice Robert H. Jackson | Majority | |
| Justice Harold H. Burton | Majority | |
| Chief Justice Fred M. Vinson | Majority | Wrote an opinion |
| Justice Tom C. Clark | Majority | |
| Justice Sherman Minton | Majority |
Full case caption
International Union of United Automobile, Etc. Workers of America, C. I. O., et al. v. O'Brien, Prosecuting Attorney, et al.
SCDB identifiers: case 1949-071, docket 1949-071-01.
Related decisions
Other cases on “Federal preemption of state legislation or regulation”
- Wissner v. Wissner
- New Jersey Realty Title Insurance Co. v. Division of Tax Appeals of New Jersey
- Amalgamated Association of Street v. Wisconsin Employment Relations Board
- Callaway v. Benton
- Panhandle Eastern Pipe Line Co. v. Public Service Commission of Indiana
- South Buffalo Railway Co. v. Ahern
Cases on the same legal provision: Labor-Management Relations Act
- American Communications Assn., C. I. O. v. Douds
- Osman v. Douds
- National Labor Relations Board v. Gullett Gin Co.
- National Labor Relations Board v. Pittsburgh Steamship Co.
- National Labor Relations Board v. Highland Park Manufacturing Co.
- National Labor Relations Board v. International Rice Milling Co., Inc.
Same Term, same area (Federalism)
- Regents of the University System of Georgia v. Carroll
- Wissner v. Wissner
- New Jersey Realty Title Insurance Co. v. Division of Tax Appeals of New Jersey
- United States v. Burnison
- Slocum v. Delaware
- Order of Railway Conductors of America v. Southern Railway Co.
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