The U.S. Supreme Court case Hill, Jr., et al. v. Wallace, Secretary of Agriculture, et al., 1921 revolved around the constitutionality of the Future Trading Act (FTA) passed by Congress in 1921 to regulate grain futures trading and impose a tax on contracts not made through designated 'contract markets'. The plaintiffs were members of the Chicago Board of Trade who argued that this act was unconstitutional as it interfered with their business operations without due process and violated their rights under the Fifth Amendment. However, they also contended that futures trading did not constitute interstate commerce and hence could not be regulated by Congress under its Commerce Clause powers. The Supreme Court ruled against them stating that while future trades might seem like local activities at first glance; they had national implications affecting prices across state lines which brought them within federal jurisdiction for regulation purposes. Therefore, it upheld FTA's constitutionality concluding that such regulatory measures were necessary to prevent manipulation or excessive speculation which could disrupt market stability thereby harming farmers and consumers alike.

The dissenting opinion in the case of Hill, Jr., et al. v. Wallace, Secretary of Agriculture, et al., argued that the Futures Trading Act was unconstitutional because it imposed a tax on futures contracts for grain not intended to be delivered but rather offset by other transactions. The dissenters believed this act exceeded Congress's power under the Commerce Clause as it interfered with states' rights to regulate their own internal commerce and infringed upon personal liberty and property rights without due process of law. They also contended that the tax was not truly an excise tax within Congress's taxing authority but instead a penalty meant to suppress certain types of trading activity deemed undesirable by lawmakers - thus making it an improper exercise of police power reserved for individual states.