The famous trials of the 20th century are the courtroom cases that either rewrote a rule of law still in force today or fixed a historical moment so firmly in public memory that the trial itself became the event. Some produced Supreme Court decisions that every police officer, prosecutor, and defense lawyer now works around. Others held individuals personally accountable for state-sponsored atrocities for the first time, or exposed how politics, race, and press coverage can bend a criminal proceeding out of shape. The cases below are the ones that did the most to change how governments prosecute, how defendants are protected, and how the public understands what a trial is for.
Nuremberg and Personal Responsibility Under International Law
In August 1945, the United States, France, Great Britain, and the Soviet Union signed an agreement creating the International Military Tribunal to prosecute senior Nazi officials for crimes committed during World War II.1Yale Law School Lillian Goldman Law Library. Charter of the International Military Tribunal Four judges, one from each signatory nation, presided over a proceeding unlike any before it.
The prosecution organized its case around four categories of charges: crimes against peace, war crimes, crimes against humanity, and conspiracy to commit any of those acts.2International Committee of the Red Cross. Agreement for the Prosecution and Punishment of the Major War Criminals of the European Axis, and Charter of the International Military Tribunal The evidence ran to thousands of captured documents, photographs, and eyewitness accounts describing systematic atrocities across occupied Europe.
Hermann Göring, the highest-ranking defendant, argued he had been following sovereign state orders. The tribunal rejected the superior-orders defense, holding that individuals bear personal responsibility under international law when ordered to commit acts that violate basic human rights. Göring was sentenced to death but killed himself in his cell the night before his scheduled execution. Twelve other defendants received death sentences, three were sentenced to life, four received shorter prison terms, and three were acquitted.
On December 11, 1946, the United Nations General Assembly unanimously adopted Resolution 95(I), affirming the legal principles recognized by the Nuremberg Charter and the tribunal’s judgment.3United Nations Audiovisual Library of International Law. Affirmation of the Principles of International Law Recognized by the Charter of the Nurnberg Tribunal Those principles became the foundation for later international criminal tribunals, including those for Rwanda and the former Yugoslavia.
The Scottsboro Case and the Right to Prepared Counsel
On March 25, 1931, a fight broke out between groups of Black and white young men riding a freight train through northern Alabama. After police stopped the train at Paint Rock, two white women aboard, Victoria Price and Ruby Bates, accused nine Black teenagers of rape. The accusations were false, made to deflect vagrancy and morality charges the women themselves were facing.4National Museum of African American History and Culture. The Scottsboro Boys
What followed was a mockery of due process. Trials began within days in Scottsboro, Alabama. The court appointed lawyers on the morning proceedings started, leaving no time for investigation or defense preparation. Eight of the nine defendants were sentenced to death.
The appeals reached the U.S. Supreme Court as Powell v. Alabama. The Court ruled that the failure to provide meaningful legal representation in a capital case violated the Due Process Clause of the Fourteenth Amendment, and that assigning lawyers at the last minute did not satisfy that requirement.5Justia. Powell v. Alabama, 287 U.S. 45 (1932) The case went through multiple retrials. During one, Ruby Bates recanted entirely and said no assault had occurred. Prosecutors kept pursuing convictions anyway. The last Scottsboro defendant was not released from prison until 1950, and Alabama did not officially pardon all nine men until 2013.
Sacco and Vanzetti: Politics Inside a Criminal Trial
On April 15, 1920, two men shot and killed a payroll clerk, Frederick Parmenter, and a security guard, Alessandro Berardelli, during a robbery at a shoe factory in South Braintree, Massachusetts. Less than a month later, police arrested Nicola Sacco and Bartolomeo Vanzetti, both Italian immigrants and self-described anarchists.6Mass.gov. Sacco and Vanzetti: Justice on Trial Both were armed when arrested. Sacco carried a .32 caliber Colt automatic pistol, and ballistics evidence linking it to the crime scene became the prosecution’s central physical exhibit.
The trial was saturated with politics. Prosecutors leaned heavily on the defendants’ radical political beliefs, suggesting those beliefs motivated a willingness to kill. The jury convicted both men of first-degree murder in July 1921. After years of appeals and worldwide protests, Sacco and Vanzetti were executed by electric chair on August 23, 1927.7Mass.gov. Reexamining Sacco and Vanzettis Trial In 1977, Massachusetts Governor Michael Dukakis issued a proclamation declaring that the trial had been permeated by prejudice and that any stigma or disgrace should be removed from the defendants’ names.
Scopes, Epperson, and Evolution in the Classroom
In 1925, Tennessee passed the Butler Act, making it illegal for any public school teacher to teach that humans evolved from other animals. The American Civil Liberties Union offered to defend anyone charged under the law, and John Scopes, a young high school science teacher, volunteered as the test case.
William Jennings Bryan, a three-time presidential candidate, joined the prosecution and argued that the people of Tennessee had the right to control what was taught in their schools. Clarence Darrow, representing Scopes, called Bryan himself to the witness stand as an expert on the Bible. Darrow pressed Bryan on whether the days of creation were literal 24-hour periods, whether Jonah literally lived inside a whale, and whether the Earth could really be only a few thousand years old. Bryan’s answers were halting and contradictory.
Scopes was convicted and fined $100. The Tennessee Supreme Court later overturned the verdict on a technicality, noting that the judge rather than the jury had set the fine. The Butler Act stayed on the books until Tennessee repealed it in 1967.
The constitutional question that Scopes never squarely resolved came before the Supreme Court in 1968. Arkansas had its own anti-evolution statute, enacted in 1928. The Court unanimously struck the law down, holding that states cannot tailor public school curricula to conform to the principles of any religious group.8Justia. Epperson v. Arkansas, 393 U.S. 97 (1968) The law existed for one reason only, the Court found: to suppress a scientific theory because it conflicted with a literal reading of Genesis. That made it an unconstitutional establishment of religion.
The Lindbergh Kidnapping and Forensic Evidence
On the night of March 1, 1932, twenty-month-old Charles Lindbergh Jr. was taken from his second-floor nursery at the family’s home in Hopewell, New Jersey.9Federal Bureau of Investigation. Lindbergh Kidnapping His father was the most famous aviator in the world. A wooden ladder was found propped against the side of the house, and a ransom note demanded $50,000. The child’s body was discovered weeks later in nearby woods.
Bruno Richard Hauptmann was arrested in September 1934 after marked ransom bills were traced to him. His trial in January 1935 drew hundreds of reporters and turned the small courthouse in Flemington, New Jersey into a media frenzy. The most devastating evidence came from Arthur Koehler, a wood identification expert from the U.S. Forest Products Laboratory. Koehler testified that one rail of the kidnapping ladder had been cut from a floorboard in Hauptmann’s attic. The nail holes in the ladder rail matched the holes in the attic joists in size, spacing, angle, and depth. The wood grain of both pieces lined up across the gap where the board had been sawed apart, and the annual growth rings were identical in number, curvature, and width.10USDA Forest Products Laboratory. Lindbergh Kidnapping – The Ladder Link Koehler calculated the odds of a random match at one in ten quadrillion.
Hauptmann maintained his innocence, and his defense argued the evidence had been planted. The jury convicted him after eleven hours, and he was executed by electric chair on April 3, 1936. The case led directly to Congress making kidnapping a federal crime when the victim is taken across state lines.
Cold War Espionage: Hiss and the Rosenbergs
The anti-communist fervor of the late 1940s produced two prosecutions that came to stand for the era. Alger Hiss, a former State Department official, was accused by Whittaker Chambers, a former Communist Party member, of having been a Soviet agent while in federal service. Chambers initially made the allegation before the House Un-American Activities Committee in 1948. When Hiss sued him for libel, Chambers produced microfilm evidence that became known as the “Pumpkin Papers” because he had hidden the documents inside a hollowed-out pumpkin on his farm.11National Archives. United States of America v. Alger Hiss
By the time prosecutors built their case, the statute of limitations for espionage had expired. A federal grand jury indicted Hiss on two counts of perjury instead. In January 1950, he was convicted and sentenced to two concurrent five-year prison terms. He maintained his innocence for the rest of his life.
The Rosenberg trial pushed Cold War anxieties further. Julius and Ethel Rosenberg were charged under the Espionage Act of 1917 with conspiring to transmit classified atomic weapons information to the Soviet Union.12Justia. Rosenberg v. United States, 346 U.S. 273 (1953) The prosecution’s star witness was Ethel’s brother, David Greenglass, who had worked as a machinist at Los Alamos. Greenglass testified that at Julius’s request, he drew sketches of atomic bomb components, prepared written descriptions, and delivered these materials to the Rosenbergs’ apartment in 1945.13Federal Bureau of Investigation. Atom Spy Case/Rosenbergs A nuclear chemist from Los Alamos confirmed at trial that Greenglass’s courtroom sketches were reasonably accurate representations of the designs used in the weapons program.
Both Rosenbergs were convicted and sentenced to death, a punishment that stunned many observers because it was almost unheard of in a conspiracy case that did not involve a direct act of violence.14Federal Judicial Center. The Rosenberg Trial They were executed on June 19, 1953. Decades later, Greenglass admitted he had fabricated parts of his testimony about Ethel’s involvement.
Sheppard v. Maxwell: Press Coverage and Fair Trials
Sam Sheppard, a Cleveland osteopath, was convicted of murdering his wife in 1954 after a trial the Supreme Court would later describe as a circus. Newspapers ran front-page editorials demanding his arrest before he was even charged. Reporters were given seats inside the bar of the courtroom, so close to the defense table that private conversations between Sheppard and his lawyers were overheard and published. Jurors were not sequestered during the trial despite saturation coverage.
The Supreme Court overturned Sheppard’s conviction, holding that the massive, pervasive, and prejudicial publicity prevented him from receiving a fair trial under the Fourteenth Amendment’s Due Process Clause.15Library of Congress. Sheppard v. Maxwell, 384 U.S. 333 (1966) The Court laid out specific measures trial judges should use when pretrial publicity threatens fairness: limiting media access to the courtroom, prohibiting lawyers, witnesses, and officials from making prejudicial public statements, sequestering the jury, delaying the trial until the publicity dies down, or transferring the case to another location. Those remedies remain the standard framework for high-profile cases.
The 1960s Trilogy That Rewrote Criminal Procedure
Three Supreme Court decisions in the 1960s fundamentally changed how the criminal justice system treats suspects and defendants. Each arose from a specific trial, and each established protections that police, prosecutors, and courts still follow today.
Mapp v. Ohio (1961)
Before Mapp, state prosecutors could use evidence seized through illegal searches with almost no consequences. Federal courts had long excluded such evidence under the Fourth Amendment, but state courts were not bound by the same rule. In 1961, the Supreme Court held that all evidence obtained through searches and seizures that violate the Constitution is inadmissible in state court, not just federal court.16Library of Congress. Mapp v. Ohio, 367 U.S. 643 (1961) The reasoning was direct: if illegally seized evidence can still be used at trial, officers have no real incentive to obey the Fourth Amendment.
Gideon v. Wainwright (1963)
Clarence Earl Gideon was charged with breaking into a poolroom in Florida. Too poor to hire a lawyer, he asked the trial court to appoint one. The judge refused, because Florida law only provided court-appointed attorneys in capital cases. Gideon represented himself, was convicted, and from prison wrote a handwritten petition to the Supreme Court. The Court unanimously ruled that the Sixth Amendment right to a lawyer is a fundamental right essential to a fair trial, and that states must provide attorneys to defendants who cannot afford one.17Justia. Gideon v. Wainwright, 372 U.S. 335 (1963) The decision established the modern public defender system.
Miranda v. Arizona (1966)
Ernesto Miranda confessed to kidnapping and assault during a two-hour police interrogation in which no one told him he could remain silent or have a lawyer present. The Supreme Court held that the confession was inadmissible because the Fifth Amendment requires specific procedural safeguards before any custodial interrogation. Police must clearly inform a suspect that they have the right to remain silent, that anything they say can be used against them in court, that they have the right to an attorney during questioning, and that an attorney will be appointed if they cannot afford one.18Justia. Miranda v. Arizona, 384 U.S. 436 (1966) If a suspect invokes either the right to silence or the right to counsel, interrogation must stop.
Batson v. Kentucky and Race in Jury Selection
For decades after Scottsboro, a subtler form of racial manipulation persisted in American courtrooms: prosecutors using peremptory challenges to strike Black jurors without giving a reason. In 1986, the Supreme Court shut that down. In Batson v. Kentucky, the Court held that the Equal Protection Clause of the Fourteenth Amendment forbids prosecutors from using peremptory challenges to remove jurors solely because of their race.19Legal Information Institute at Cornell Law. James Kirkland Batson, Petitioner, v. Kentucky
The ruling created a three-step framework. A defendant must first show circumstances suggesting that race motivated the juror strikes. The burden then shifts to the prosecution to offer a race-neutral explanation. If the explanation is pretextual, the strike is unconstitutional. Before Batson, prosecutors could and routinely did eliminate every Black juror from a panel without consequence. The decision has since been extended to cover gender-based discrimination as well.
O.J. Simpson: Two Verdicts, Two Standards of Proof
No trial in American history attracted more sustained public attention than the 1995 prosecution of O.J. Simpson for the murders of his ex-wife Nicole Brown Simpson and her friend Ronald Goldman. Simpson, a former football star and celebrity, was charged after a slow-speed highway chase watched live by an estimated 95 million viewers. The trial lasted nearly nine months and was televised from start to finish.
The prosecution built its case heavily on DNA evidence. Blood matching Simpson’s was found near shoe prints at the crime scene, blood matching Nicole’s was found on socks in Simpson’s bedroom, and blood was discovered in Simpson’s Ford Bronco and on his driveway. The physical evidence also included a pair of rare Aris Light leather gloves, one found at the murder scene and the other behind Simpson’s house, of a type and size Nicole had purchased for him at Bloomingdale’s.
Simpson’s defense attacked the evidence collection itself rather than offering an alternative theory of who committed the murders. It focused on the police department’s handling of blood samples, the potential for contamination at the crime scene, and the conduct of specific investigators. The most memorable moment came when Simpson tried on the gloves and appeared unable to pull them over his hands. Defense attorney Johnnie Cochran turned it into a closing-argument refrain: “If it doesn’t fit, you must acquit.” The jury deliberated for less than four hours before returning not guilty verdicts on both murder counts.
In 1997, the families of Goldman and Brown sued Simpson for wrongful death. In a civil trial, the plaintiff only needs to show the defendant was more likely than not responsible, a far lower bar than the “beyond a reasonable doubt” standard required for a criminal conviction. The civil jury found Simpson liable and ordered him to pay $33.5 million in damages. He was never able to pay the full amount, and the judgment remained largely uncollected at the time of his death in 2024. The split outcome remains a textbook example of how the same set of facts can produce opposite results depending on the legal standard applied.