166 U.S. 290 (1897)
United States v. Trans-Missouri Freight Association is a landmark case in the realm of antitrust law, marking a critical moment in the enforcement of the Sherman Antitrust Act.
Does a voluntary association of railroads that agree to fix rates and restrict competition violate the Sherman Antitrust Act by constituting a 'contract or conspiracy in restraint of trade'?
Under the Sherman Antitrust Act, contracts, combinations, or conspiracies that unduly restrain interstate trade or commerce are illegal, irrespective of the reasonableness of the restraints.
The Supreme Court held that the Trans-Missouri Freight Association violated the Sherman Act, affirming that any contract or combination that restrains trade among states is illegal, regardless of its reasonableness.
United States v. Trans-Missouri Freight Association is a foundational case in antitrust law, significant for clarifying that cooperative agreements between competitors that restrain trade are per se illegal under the Sherman Act. The case set a precedent for how strictly the Act would be enforced and established the per se rule against price fixing and other forms of collusion among competitors. This decision reflected a commitment to preserving competitive market conditions and served as a warning to businesses contemplating similar cooperative agreements. For law students, it illustrates the origins of modern antitrust principles and the judiciary's role in interpreting congressional intent in economic regulations.