Loyalty oath or non-Communist affidavit (general): Supreme Court decisions

Every U.S. Supreme Court decision from the 1946 through 2025 Terms that the Supreme Court Database classifies under the issue “Loyalty oath or non-Communist affidavit (general),” part of the First Amendment area.

5decisions

80%favorable to the petitioner

20%unanimous

2altered precedent or struck a law

Decisions by decade

1950s5

Most majority opinions

William J. Brennan Jr.2

Stanley F. Reed1

Robert H. Jackson1

Legal provisions most often involved

First Amendment (speech, press, and assembly)3

Labor-Management Relations Act2

All 5 decisions, newest first

Speiser v. RandallLaw held unconstitutional
357 U.S. 513Decided June 30, 19587–1William J. Brennan Jr.
First Unitarian Church of Los Angeles v. County of Los AngelesLaw held unconstitutional
357 U.S. 545Decided June 30, 19587–1William J. Brennan Jr.
First Methodist Church of San Leandro v. Horstmann
357 U.S. 568Decided June 30, 19587–1Per curiam
National Labor Relations Board v. Dant
344 U.S. 375Decided February 2, 19539–0Stanley F. Reed
National Labor Relations Board v. Highland Park Manufacturing Co.
341 U.S. 322Decided May 14, 19516–2Robert H. Jackson

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