Dianne Knox v. Service Employees International Union
567 U.S. 298 · Decided June 21, 2012 · Supreme Court of the United States
Record summary. This page is generated from the Supreme Court Database’s coded data about the case. It describes who decided what, not the Court’s reasoning. Read the opinion itself before relying on it. Not legal advice.
At a glance
Dianne Knox v. Service Employees International Union was decided on June 21, 2012 by a vote of 7–2. The Court reversed the lower court's decision and remanded the case. Justice Samuel A. Alito Jr. wrote the opinion of the Court. SCDB classifies its main issue as “Union-union member disputes” in the Unions area.
Read the opinion
Case details
- Citations
- 567 U.S. 298 · 132 S. Ct. 2277 · 183 L. Ed. 2d 281 · 2012 U.S. LEXIS 4663
- Docket number
- 10-1121
- Decided
- June 21, 2012
- Argued
- January 10, 2012
- Court era
- Roberts Court
- Decision type
- Opinion of the Court (orally argued)
- Disposition
- Reversed and remanded
- Outcome for petitioner
- The petitioning party received a favorable disposition
- Vote
- 7–2
- Majority opinion
- Samuel A. Alito Jr.
- Opinion assigned by
- John G. Roberts Jr.
- How the case arrived
- Certiorari
- Issue (SCDB)
- Union-union member disputes
- Issue area
- Unions
- Legal provision
- First Amendment (speech, press, and assembly)
- Type of law
- Constitutional amendment
- Decision direction (SCDB)
- Conservative what this means
How the Justices voted
| Justice | Vote | Separate writing |
|---|---|---|
| Justice Antonin Scalia | Majority | |
| Justice Anthony M. Kennedy | Majority | |
| Justice Clarence Thomas | Majority | |
| Justice Ruth Bader Ginsburg | Special concurrence | |
| Justice Stephen G. Breyer | Dissent | Wrote an opinion |
| Chief Justice John G. Roberts Jr. | Majority | |
| Justice Samuel A. Alito Jr. | Majority | Wrote an opinion |
| Justice Sonia Sotomayor | Special concurrence | Wrote an opinion |
| Justice Elena Kagan | Dissent |
Full case caption
Dianne Knox, et Al., Petitioners v. Service Employees International Union, Local 1000
SCDB identifiers: case 2011-070, docket 2011-070-01.
Related decisions
Other cases on “Union-union member disputes”
- Air Line Pilots Association v. Joseph E. O'Neill
- International Organization of Masters v. Timothy A. Brown
- Lynn L. Breininger v. Sheet Metal Workers International Association Local Union No. 6
- Sheet Metal Workers' International Assn. v. Lynn
- Reed v. United Transportation Union
- National Labor Relations Board v. International Brotherhood of Electrical Workers
Cases on the same legal provision: First Amendment (speech, press, and assembly)
- American Tradition Partnership, Inc. v. Steve BullockLaw held unconstitutional
- Virgil D. 'gus' Reichle, Jr. v. Steven Howards
- Edmund G. Brown, Jr. v. Entertainment Merchants AssociationLaw held unconstitutional
- Arizona Free Enterprise Club's Freedom Club Pac v. Ken BennettLaw held unconstitutional
- Sorrell v. Ims Health Inc.Law held unconstitutional
- Agency for International Development v. Alliance for Open Society International, Inc.Law held unconstitutional
Same Term, same area (Unions)
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