In the United States v. Loughrey case of 1898, the Supreme Court ruled on a matter involving property rights and mining claims in Colorado. The defendant, Loughrey, had staked a claim to mine silver on public land under the Mining Act of 1872. However, he did not follow through with required improvements within six months as stipulated by law. Subsequently, another party made improvements and claimed ownership over it which led to legal disputes between both parties. The court held that failure to make necessary improvements within six months resulted in forfeiture of all exclusive rights granted by location under federal laws governing mining claims on public lands; thus making such unimproved locations open for relocation like any other vacant ground subject only to vested rights acquired prior thereto by others than locators themselves. This ruling clarified that while initial discovery and location gave miners certain privileges regarding mineral deposits found therein; these were conditional upon compliance with statutory requirements including performance of annual labor or making improvements equivalent thereof during each year after location until patent was obtained from government.

In the dissenting opinion for United States v. Loughrey, Justice Harlan argued that the majority's interpretation of the law was incorrect and overly broad. He contended that Congress did not intend to make it a crime for anyone who had been employed by or associated with any branch of government to accept compensation in relation to matters they were involved in during their tenure, regardless of whether they continued such involvement after leaving public service. Instead, he believed that this prohibition should only apply if there was an ongoing relationship between the former official and his previous governmental department or agency at the time when he received payment. Furthermore, he disagreed with applying this statute retroactively as it could potentially criminalize actions which were legal at their time of occurrence but became illegal due to subsequent changes in legislation. In conclusion, Justice Harlan felt that both principles - limiting application based on current affiliation and avoiding retroactive enforcement - were essential safeguards against unjust prosecution under this law.