The Parker et al. v. Fleming case in 1946 revolved around the constitutionality of the Emergency Price Control Act of 1942, which was enacted during World War II to prevent inflation and stabilize prices. The appellants, who were landlords of rent-controlled properties in New York City, argued that the act violated their Fifth Amendment rights by depriving them of property without due process and just compensation. They also contended that it exceeded Congress's power under the Commerce Clause because it regulated rents for local (not interstate) housing. However, the Supreme Court upheld both aspects challenged by a unanimous decision: Justice William O Douglas wrote for all nine justices stating that wartime conditions justified such legislation as a reasonable exercise of government power to control economic disruption caused by war-related price increases; thus not violating any constitutional provisions or exceeding congressional authority under commerce clause. This landmark ruling affirmed federal government’s ability to regulate private property use during national emergencies and set precedent for future cases involving governmental regulation on private industries.

In the dissenting opinion for Parker et al. v. Fleming, Justice Robert H. Jackson disagreed with the majority's ruling that upheld federal price controls on agricultural commodities during World War II under the Emergency Price Control Act of 1942 (EPCA). He argued that such a broad interpretation of Congress' power to regulate commerce was unconstitutional and exceeded its intended scope as defined by the Constitution's framers. Jackson contended that this decision allowed Congress to control not just interstate commerce but also intrastate activities, which he believed should be regulated by individual states rather than the federal government. Furthermore, he expressed concern about potential abuses of power resulting from an overly expansive view of Congressional authority over economic matters.