In the case of Louisville & Nashville Railroad Company v. Scott in 1910, the U.S Supreme Court ruled on a dispute involving railroad freight charges. The plaintiff, Scott, sued the Louisville & Nashville Railroad Company for overcharging him for shipping his goods across state lines. He argued that under Kentucky law he was entitled to recover twice the amount he had been overcharged as damages. However, this conflicted with federal law which only allowed recovery of actual damages plus interest and costs. The court held that while states have power to regulate commerce within their borders, they cannot interfere with interstate commerce or conflict with federal regulations governing it - an area reserved exclusively for Congress by Constitution's Commerce Clause. Therefore, Kentucky’s statute allowing double recovery was invalid when applied to interstate shipments because it interfered with rates established under authority of Interstate Commerce Act. This decision reinforced supremacy of federal laws regulating interstate commerce over conflicting state laws and affirmed importance of uniformity in such regulation nationwide.

In the dissenting opinion for Louisville & Nashville Railroad Company v. Scott, Justice Harlan argued that the majority's decision was inconsistent with previous rulings and violated principles of federalism. He contended that it was not within the jurisdiction of a federal court to intervene in a state court matter unless there were constitutional issues at stake or if there was an abuse of power by the state courts. In this case, he believed neither condition had been met as it involved only questions about Kentucky law and its application to specific facts rather than broader constitutional concerns. Furthermore, he noted that no evidence suggested any bias or unfairness on part of Kentucky courts towards out-of-state corporations like L&N Railroad Co., thus making intervention unnecessary and inappropriate according to him.