In the case of Murphy v. Packer in 1893, the United States Supreme Court addressed a dispute over land ownership rights. The plaintiff, Murphy, claimed that he had purchased a parcel of land from an individual who had obtained it through preemption - a legal principle allowing individuals to acquire public lands before they were offered for sale publicly. However, this claim was disputed by Packer who argued that he held rightful title to the property because his predecessor-in-interest had acquired it under the Homestead Act - another law governing distribution and acquisition of federal lands. The court ruled in favor of Packer stating that homesteading rights took precedence over preemption claims when both parties made improvements on their respective portions of land at approximately same time without knowledge about each other's actions.

The dissenting opinion in the case of Murphy v. Packer argued that the majority's decision to uphold a tax on commercial brokers was incorrect and violated principles of interstate commerce. The dissent contended that this tax, imposed by Pennsylvania, unfairly burdened out-of-state businesses who had no physical presence or property within the state but were merely conducting business transactions there. They believed it was unconstitutional for a state to levy taxes on activities occurring entirely outside its borders and involving non-residents. This view held that such taxation infringed upon federal authority over interstate commerce, as established by the Commerce Clause of the U.S Constitution.