## Facts

- International Minerals & Chemical Corp. (IMC) shipped sulfuric acid and hydrofluosilicic acid in interstate commerce.
- A federal regulation required shippers to describe hazardous materials on shipping papers using the prescribed shipping name and classification, including “Corrosive Liquid.”
- The United States charged IMC by information in the U.S. District Court for the Southern District of Ohio with “knowingly” failing to include the required classification on shipping papers, allegedly violating an ICC regulation issued under 18 U.S.C. § 834(a).
- The criminal penalty provision, 18 U.S.C. § 834(f), applied to anyone who “knowingly violates” such a regulation.
- The district court dismissed the information, concluding it did not adequately allege the “knowing violation” required by § 834(f).
- The United States appealed; the case reached the Supreme Court.

## Issues

1. Whether “knowingly violates” in 18 U.S.C. § 834(f) requires proof that the defendant knew the specific regulation and its legal requirements.
2. Whether it is sufficient to prove that the defendant knew the relevant facts and engaged in the prohibited conduct (shipping corrosive acids while omitting the required classification from shipping papers).

## Decision

- The Supreme Court reversed the dismissal.
- The Court held that § 834(f) does not require proof that the defendant knew the existence or content of the regulation.
- The government must prove knowledge of the facts that make the conduct unlawful (including awareness of the nature of the materials shipped and the intentional omission on shipping papers).
- Because the case involved dangerous materials, the Court treated regulation as foreseeable and rejected a due process/vagueness challenge on these facts.
- The information’s allegation that IMC “did knowingly fail” to show the required classification was sufficient to charge a violation under § 834(f).

## Legal Principles

- “Knowingly” in a regulatory criminal statute generally refers to knowledge of the relevant facts, not knowledge of the law, absent a clear statutory signal to the contrary.
- For public-welfare-type offenses involving dangerous or deleterious products, persons who know they are dealing with such materials may be presumed aware that strict regulation exists.
- In this setting, criminal liability may attach without proof that the defendant knew the precise regulatory text, so long as the defendant knowingly engaged in the factually prohibited conduct.
- A statute and implementing safety regulations applied to obviously hazardous materials are not unconstitutionally vague merely because they do not require proof of knowledge of the regulation.

## Conclusion

The Court held that, for criminal enforcement of hazardous-material transportation regulations, “knowingly” requires proof that the defendant knew the material facts and intentionally failed to comply with required shipping-paper descriptions, not proof that the defendant knew the specific regulation or its precise legal command.


United States v. Int’l Minerals & Chem. Corp., 402 U.S. 558 (1971)