In the United States v. Healy et al., 1963, the Supreme Court ruled on a case involving an antitrust law violation by several dairy companies and their executives. The defendants were accused of conspiring to fix prices for milk sold in Illinois and Wisconsin, violating Section 1 of the Sherman Act. They argued that they could not be prosecuted because their actions took place outside U.S jurisdiction, as all meetings occurred in Wisconsin while the impact was felt primarily in Illinois. However, the court rejected this argument stating that if there is intent to affect U.S commerce and such effect actually occurs then it falls under American jurisdiction regardless of where those decisions are made or acts committed. Therefore, even though these meetings happened outside Illinois (where effects were felt), since they intended to influence trade within a state and did so successfully - it constituted interstate commerce which comes under federal purview according to Commerce Clause of Constitution.

In the dissenting opinion for United States v. Healy et al., the justice argued that the majority's decision to uphold a conviction based on an interpretation of ambiguous language in a statute was unjust. The justice believed this ruling violated principles of due process, as individuals should have clear notice of what constitutes illegal behavior under any given law. Furthermore, they contended that it is Congress' responsibility to clearly define criminal offenses and penalties within their statutes; if such definitions are unclear or vague, then courts should not interpret them expansively so as to potentially infringe upon individual liberties. In this case specifically, where defendants were convicted for failing to report certain transactions with foreign affiliates which they did not believe fell under the scope of "foreign commerce," ambiguity in statutory language led them unknowingly into violation - something which could have been avoided had Congress provided clearer guidelines within its legislation.