Whether the Fourteenth Amendment requires States to provide a jury trial for serious criminal offenses.
Holding
Yes. The right to a jury trial in serious criminal cases is fundamental to the American scheme of justice and is protected against state action by the Fourteenth Amendment's Due Process Clause.
Reasoning
The Court applied its selective-incorporation approach: a Bill of Rights guarantee applies to the States when it is a fundamental principle of liberty and justice, basic to the American system of jurisprudence, or essential to a fair trial. The Court held that the Sixth Amendment jury-trial guarantee meets that standard in the context of American criminal justice.
History strongly supported that conclusion. Criminal juries were a long-established protection in England, were claimed by the colonists as an essential liberty, figured in grievances against the Crown, and were expressly preserved in Article III and the Sixth Amendment. Every State also protected jury trials for serious crimes, confirming the nation's enduring judgment that the institution is fundamental.
A criminal jury serves as a structural safeguard against arbitrary official power. It interposes the common-sense judgment of the community between an accused person and a potentially overzealous prosecutor, biased or eccentric judge, or government determined to use criminal charges oppressively. The Constitution's jury guarantees reflect a decision not to leave the power to determine guilt and punish serious crime solely to judges.
The Court rejected contrary statements in earlier cases, especially Palko v. Connecticut and Snyder v. Massachusetts, as dicta rather than holdings resolving a State's complete denial of a jury for a serious crime. Maxwell v. Dow likewise did not control because it involved the size of a jury, not the denial of any jury trial in a serious criminal case.
The ruling did not mean that every bench trial is unfair. Defendants may validly waive a jury, and States may use nonjury procedures for petty offenses. But a State that maintains the ordinary Anglo-American criminal process cannot deny an accused a jury when charged with a serious offense.