Justice Louis Brandeis’s legacy on the Supreme Court rests on a run of dissents and opinions, written between 1916 and 1939, that lost in his own time and became the law afterward. He defined constitutional privacy before courts were ready to recognize it, articulated the modern free speech standard four decades before it was adopted, built the federalism argument that produced the phrase “laboratories of democracy,” and wrote the majority opinion that ended federal common law. Few justices have been vindicated by history as consistently.
The Olmstead Dissent and the Right to Be Let Alone
In Olmstead v. United States (1928), federal agents wiretapped bootleggers’ telephone lines without ever physically entering their property. The majority held that the Fourth Amendment reached only physical trespass, so warrantless wiretapping was constitutional.1Justia U.S. Supreme Court Center. Olmstead v. United States, 277 U.S. 438 (1928)
Brandeis dissented. He wrote that the Constitution’s framers intended to protect “Americans in their beliefs, their thoughts, their emotions and their sensations,” and that the Fourth Amendment conferred “the right to be let alone — the most comprehensive of rights, and the right most valued by civilized men.”1Justia U.S. Supreme Court Center. Olmstead v. United States, 277 U.S. 438 (1928) The phrase was not new to him. He and Samuel Warren had used it in a Harvard Law Review article in 1890, borrowing from Judge Thomas Cooley. What was new was the insistence that the Fourth Amendment had to keep pace with technology. Limiting it to physical break-ins, he argued, would turn the amendment into a dead letter as surveillance tools grew more sophisticated.
The dissent also carried a warning about government lawbreaking. If the government uses illegally obtained evidence to convict, Brandeis wrote, it “becomes a lawbreaker” and “breeds contempt for law; it invites every man to become a law unto himself; it invites anarchy.”
In 1967, the Supreme Court overruled Olmstead in Katz v. United States, holding that the Fourth Amendment “protects people, rather than places” and discarding the trespass doctrine.2Justia U.S. Supreme Court Center. Katz v. United States, 389 U.S. 347 (1967) Brandeis’s view had become the governing rule.
Whitney v. California and the Modern Free Speech Standard
In Whitney v. California (1927), a woman was convicted under state law for helping organize the Communist Labor Party of California. The majority upheld the conviction. Brandeis concurred in the result on narrow procedural grounds but wrote separately on the First Amendment, and that opinion is what endured.
Fear of unpopular ideas, he argued, is never a sufficient reason to silence anyone. The remedy for dangerous or wrong-headed speech is more speech, not enforced silence. “Fear of serious injury cannot alone justify suppression of free speech and assembly,” he wrote. “Men feared witches and burnt women.” Suppression is justified only when the threatened harm is both serious and so imminent there is no time for discussion before it occurs.
He grounded the standard in a broader claim: the founders valued liberty not merely as a means to political stability but as essential to the pursuit of truth. The public, given open debate, could be trusted to sort out falsehood.
The Whitney majority stood for decades. Then in 1969, in Brandenburg v. Ohio, the Supreme Court adopted essentially the standard Brandeis had proposed: the government may not restrict speech unless it is directed to inciting and likely to produce imminent lawless action. The concurrence had become doctrine.
Laboratories of Democracy
In New State Ice Co. v. Liebmann (1932), the Court struck down an Oklahoma law requiring a government license to manufacture or sell ice, holding that it unconstitutionally restricted liberty of contract.3Justia U.S. Supreme Court Center. New State Ice Co. v. Liebmann, 285 U.S. 262 (1932) Brandeis dissented, and produced one of the most quoted lines in American legal history.
“It is one of the happy incidents of the federal system,” he wrote, “that a single courageous state may, if its citizens choose, serve as a laboratory; and try novel social and economic experiments without risk to the rest of the country.”4Legal Information Institute. New State Ice Co. v. Liebmann The reasoning was practical. Some state experiments fail, and the failure stays local. The ones that work can spread.
The argument was also one of judicial restraint. The country was deep in the Great Depression, and Brandeis thought the Supreme Court should not be second-guessing the economic choices of state legislatures when conventional approaches were plainly not working. The “laboratories of democracy” phrase has since been invoked across the political spectrum and remains one of the most commonly cited arguments for federalism in American law.
Erie Railroad and the End of Federal Common Law
One of Brandeis’s most consequential majority opinions came near the end of his tenure. In Erie Railroad Co. v. Tompkins (1938), a man was injured by a passing train while walking along railroad tracks in Pennsylvania. The technical question was which law a federal court should apply when hearing a case between citizens of different states.
For nearly a century, under Swift v. Tyson (1842), federal courts had been free to develop their own general common law in such cases, often reaching results different from the state courts next door. Brandeis wrote the opinion overruling that precedent. “There is no federal general common law,” he declared. Except in matters governed by the Constitution or federal statutes, the law to be applied “is the law of the State.”5Justia U.S. Supreme Court Center. Erie Railroad Co. v. Tompkins, 304 U.S. 64 (1938)
The practical effect was large. Before Erie, a corporation could sometimes file in federal court specifically to avoid an unfavorable state rule. The decision closed that door and made outcomes more predictable for ordinary litigants. Erie remains one of the foundational cases taught in every American law school and still governs how federal courts handle state-law claims.6Federal Judicial Center. Cases that Shaped the Federal Courts – Erie Railroad Co. v. Tompkins
The Curse of Bigness
Brandeis spent his pre-Court years arguing that concentrated corporate power was itself a threat to democracy. He coined the phrase “curse of bigness” in essays published in Harper’s Weekly between 1913 and 1914, contending that the success of the great trusts came mainly from monopoly power rather than superior management. In 1912, he told Congress that “we cannot maintain democratic conditions in America if we allow organizations to arise in our midst with the power of the large trusts.”
His approach differed from Theodore Roosevelt’s. Roosevelt wanted to regulate monopolies. Brandeis wanted to prevent them from forming in the first place, by regulating competition so smaller businesses could compete on fair terms. On the Court, he recused himself from many major antitrust cases because of his prior advocacy, but his writings shaped the thinking of his successor, Justice William Douglas, who carried that skepticism into antitrust law through the mid-1970s. The framework has seen renewed attention as regulators and scholars confront the power of large technology companies.
Breaking with the New Deal
Brandeis’s progressive reputation did not translate into reliable support for President Franklin Roosevelt’s New Deal. On May 27, 1935, the Supreme Court unanimously struck down three components of Roosevelt’s program, and Brandeis voted with the majority each time. Roosevelt reportedly asked, “Well, what about old Isaiah?” — his nickname for Brandeis.
The votes followed from Brandeis’s deeper principle. He distrusted concentrated power whether it sat in corporations or in the federal government. Many early New Deal programs delegated sweeping authority to executive agencies with little congressional guidance, and he treated that as its own form of dangerous bigness. He favored reform through state experimentation and limited federal action, not through broad grants of executive power.
A Confirmation That Changed the Senate
President Woodrow Wilson nominated Brandeis on January 28, 1916.7Justia U.S. Supreme Court Center. Justice Louis Brandeis Corporate lawyers who had faced him on the other side of reform fights organized against the nomination. Former President William Howard Taft signed a petition opposing it. Brandeis was also the first Jewish person nominated to the Court, and anti-Semitism ran through the opposition even where it was not stated openly.
The fight was heated enough that the Senate Judiciary Committee held its first-ever public hearings on a Supreme Court nominee.8U.S. Capitol – Visitor Center. Senate Resolution to Advise and Consent to the Appointment of Louis D. Brandeis to be an Associate Justice of the Supreme Court, June 1, 1916 For four months, witnesses testified about his character and legal work. The Senate confirmed him on June 1, 1916, by a vote of 47 to 22.7Justia U.S. Supreme Court Center. Justice Louis Brandeis That process permanently changed how the Senate scrutinizes judicial nominees. Before Brandeis, confirmations were largely handled behind closed doors.
A Legacy Written in Later Majorities
Brandeis retired on February 13, 1939, after more than twenty-two years on the Court, and died in 1941.7Justia U.S. Supreme Court Center. Justice Louis Brandeis The arc of his influence is unusual in Supreme Court history: a justice whose most important work appears in dissents and concurrences that lost at the time and were adopted later. The privacy argument from Olmstead became law in 1967. The free speech standard from Whitney became law in 1969. The federalism argument from New State Ice became a permanent part of American constitutional vocabulary. And in Erie, he wrote directly for the Court, closing out nearly a century of federal common law in a single opinion.