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Sherman Antitrust Act
July 2, 1890· Law or policy· Laws, labor & antitrust
Well documentedSolid records, texts or physical evidence.
The first US federal antitrust law, banning combinations 'in restraint of trade' and attempts to monopolize.
See it on the Innovation & Wealth map →What happened
Named for Ohio Senator John Sherman and signed by President Benjamin Harrison, it passed the Senate 51–1 and the House unanimously. Its two key sections are short and broad: Section 1 bans contracts and combinations that restrain trade; Section 2 bans monopolizing. Early courts read it narrowly. In 1895 the Supreme Court let the sugar trust, with about 98% of US refining, survive, while judges used the law against strikers, notably in the 1894 Pullman strike.
Impact on society and the economy
It remains the backbone of US antitrust law, behind the breakups of Standard Oil in 1911 and AT&T in 1984 and today's cases against Big Tech.
How we know
The statute text, Congressional Record debates, and Supreme Court rulings from United States v. E. C. Knight Co. (1895) to Standard Oil Co. v. United States (1911).
Still debated
What Congress meant is still argued: protecting consumers from high prices, or protecting small businesses and democracy from concentrated power? That debate shapes antitrust today.
Inside this (1)
Connections (5)
▸Sherman Antitrust Act was the law behind Standard Oil breakupWell documented
The connection
The 1890 Sherman Act banned combinations 'in restraint of trade' and monopolizing. The government charged Standard with both, and the Supreme Court agreed. But Chief Justice Edward White's opinion read the law to ban only 'unreasonable' restraints, the 'rule of reason,' which left courts to judge each case by its effects.
When and how
Supreme Court, Washington, May 15, 1911; Chief Justice White wrote for the majority; Justice John Marshall Harlan partly dissented, saying the Court was rewriting the statute.
How we know
The opinion, Standard Oil Co. of New Jersey v. United States, 221 U.S. 1, rests explicitly on Sections 1 and 2 of the Sherman Act.
Debates
Did the rule of reason make antitrust workable, or weaken it by letting judges excuse big firms? Lawyers and economists still argue.
▸Sherman Antitrust Act was strengthened by Clayton Act and the Federal Trade CommissionWell documented
The connection
The Sherman Act's broad wording left judges to decide what was illegal, and the 1911 'rule of reason' worried reformers that courts would excuse big trusts. Courts had also used it against striking unions. Congress responded by listing specific banned practices, exempting labor, and creating an expert agency, the FTC, to watch competition continuously.
When and how
Washington, 1914; President Woodrow Wilson, his adviser Louis Brandeis, and Representative Henry Clayton of Alabama. Both laws supplement the Sherman Act rather than replace it.
How we know
Congressional debates and reports cite the Sherman Act's gaps and the 1911 decisions; antitrust cases today routinely invoke the laws together.
Debates
The early FTC was widely judged weak, and courts soon narrowed the union exemption; whether the new laws truly strengthened Sherman was disputed for decades.
▸Sherman Antitrust Act is the law used in Antitrust cases against Google, Meta, Amazon and AppleWell documented
The connection
Section 2 of the 1890 Sherman Act, which bans monopolizing, underpins the Justice Department's suits against Google and Apple. Courts ask whether a firm has monopoly power and kept it through exclusionary conduct rather than better products, the test applied in US v. Microsoft (2001). The FTC's cases apply similar standards under its own 1914 law.
When and how
Google search case filed 2020 in Washington, D.C.; Google ad-tech case 2023 in Alexandria, Virginia; Apple case March 2024 in New Jersey.
How we know
The complaints and rulings cite Sherman Act Section 2 directly; Judge Mehta's 2024 opinion found Google violated it.
Debates
Whether a law written for railroads and oil trusts fits free products paid for with data and ads, where the usual sign of harm, higher prices, is hard to show.
▸Sherman Antitrust Act was the basis of Breakup of AT&TWell documented
The connection
The Justice Department's 1974 suit charged AT&T with illegally monopolizing telephone service and equipment under Section 2 of the Sherman Act. After Judge Greene refused in 1981 to dismiss the case, AT&T agreed in 1982 to spin off its local phone companies, making the 1890 law the tool for the largest corporate breakup in US history.
When and how
Washington, D.C.: suit filed November 1974, trial 1981, settlement January 1982 before Judge Harold Greene; the breakup took effect January 1, 1984.
How we know
The court filings and the 1982 consent decree rest directly on the Sherman Act.
Debates
Whether the government would have won at trial is uncertain; AT&T may have settled partly to escape old limits and enter the computer business.
▸Robber barons and the great trusts provoked Sherman Antitrust ActMostly agreed
The connection
Public anger at trusts in oil, sugar, whiskey and railroads, voiced by farmers, small businesses and both parties' 1888 platforms, pushed Congress to act. The Sherman Act outlawed combinations 'in restraint of trade' and monopolization, the first federal attempt to curb concentrated corporate power.
When and how
Washington, D.C., 1888–90; Senator John Sherman of Ohio introduced it, and President Benjamin Harrison signed it on July 2, 1890.
How sure are we?
Congressional debates name Standard Oil and other trusts directly, and both 1888 party platforms condemned trusts.
Debates
Historians debate whether Congress truly meant to break up trusts or passed a vague law to quiet voters; it was weakly enforced for a decade.