# What is the legal case United States v.

United States Gypsum Company about?

legalpdf.io · August 4, 2026

> This case involved a civil proceeding brought by the U.S. government against major gypsum board manufacturers for alleged price-fixing violations of...

This case involved a civil proceeding brought by the U.S.

government against major gypsum board manufacturers for alleged price-fixing violations of the Sherman Antitrust Act.

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The Supreme Court's 1978 decision in this case established an important legal standard, ruling that the "intent" to fix prices is necessary to prove a per se violation of the Sherman Act.

The case centered on the gypsum industry, which was highly concentrated with just 9-15 major producers accounting for over 94% of national sales in the 1960-1973 period.

Many of the major gypsum producers were members of the industry trade group, the Gypsum Association, which was accused of facilitating the alleged price-fixing conspiracy.

The Supreme Court rejected the "facilitating practices doctrine" used by the lower court, which had allowed price-fixing to be inferred from certain industry practices like price announcements.

The Court ruled that the government had to prove the defendants possessed "a conscious commitment to a common scheme designed to achieve an unlawful objective" in order to establish a per se violation.

This case helped define the line between permissible and impermissible industry collaboration, with the Court noting the "gray zone" between acceptable and illegal business conduct.

The Supreme Court's decision overturned the convictions of the six corporate defendants and seven individual executives who had been found guilty at the trial level.

The ruling was seen as strengthening the legal protections for information exchanges and other industry coordination practices that do not involve an express agreement to fix prices.

The case is considered an important precedent in antitrust law, with the Court's emphasis on proving specific intent and the difficulty of distinguishing legal from illegal behavior.

A related case, Truck Insurance Exchange v.

Kaiser Gypsum Co., involved asbestos-related lawsuits against gypsum product manufacturers that had led to bankruptcy filings.

The United States v.

United States Gypsum Company decision continues to be studied and debated by antitrust scholars as an illustration of the Court's evolving jurisprudence in this area.

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