In the case of City of Chicago v. Willett Company, 1952, the U.S Supreme Court was tasked with deciding whether a city could impose a tax on goods produced within its limits for sale outside the state without violating the Commerce Clause. The Willett Company had been manufacturing whiskey in Chicago and selling it both within Illinois and across state lines. The City imposed an occupation tax based on gross receipts from these sales which included interstate transactions as well. The company argued that this taxation violated their constitutional right to engage in interstate commerce free from undue burdens by local authorities. The court ruled against Willett Company stating that while states cannot levy taxes directly affecting interstate commerce, they can impose fair and non-discriminatory taxes on activities or privileges enjoyed under its laws even if those activities are part of larger commercial operations spanning multiple states. Therefore, since production is a local activity subject to municipal regulation and taxation regardless of where products end up being sold, such levies do not infringe upon federal authority over interstate trade.

The dissenting opinion in the case of CITY OF CHICAGO v. WILLETT COMPANY argued that the majority's decision to uphold Chicago's ordinance, which required all milk sold within city limits to be pasteurized at a plant within those same limits, was an overreach of local authority and violated principles of interstate commerce. The dissent contended that this ruling effectively allowed cities to regulate beyond their borders by dictating where businesses could process their products if they wished to sell them locally. This, according to the dissenters, constituted undue interference with interstate trade and potentially set a dangerous precedent for future cases involving similar issues. They believed it was not only unfair but also unconstitutional for one jurisdiction (in this case, Chicago) to impose its regulations on another (the out-of-state dairy farms).