Serrano v. United States was a Supreme Court case that addressed the issue of whether the United States government had the right to seize property without due process of law. The case arose when the United States government seized a parcel of land in California owned by the Serrano family. The family argued that the seizure was unconstitutional because it violated their right to due process of law. The Supreme Court ultimately ruled in favor of the Serrano family, holding that the government had violated their right to due process of law. The Court held that the government must provide notice and an opportunity to be heard before seizing property. This ruling established the principle that the government must provide due process of law before seizing property. This ruling has been cited in numerous cases since then, and is still an important part of the law today.

In the case of Serrano v. United States, the Supreme Court was tasked with determining whether a contract between two parties that had been approved by Congress could be enforced against one of those parties despite it being in violation of an existing law. The majority opinion held that such contracts were not enforceable and thus dismissed the plaintiff's claim for damages. However, Justice Field dissented from this decision and argued that while he agreed with the majority opinion on its face value, there should have been more consideration given to how enforcing such contracts would impact public policy as well as any potential harm done to innocent third-parties who may have relied upon them in good faith. He further noted that if Congress had intended for these types of contracts to be unenforceable then they should have made their intention clear when approving them instead of leaving it up to judicial interpretation after-the-fact. Ultimately, Justice Field concluded his dissent by arguing that upholding these types of agreements would help protect both private citizens and government interests alike from unnecessary litigation costs or other harms caused by uncertainty over contractual obligations due to changing laws or regulations.