Rodd v. Heartt was a United States Supreme Court case that dealt with the issue of whether a contract between two parties was valid. The case involved a contract between two parties, Rodd and Heartt, in which Rodd agreed to pay Heartt a certain amount of money for the use of a certain piece of land. Heartt then sold the land to a third party without Rodd's knowledge or consent. Rodd sued Heartt for breach of contract, arguing that the contract was still valid and that Heartt had violated it by selling the land without his consent. The Supreme Court ultimately ruled in favor of Rodd, finding that the contract was still valid and that Heartt had breached it by selling the land without Rodd's consent. The Court held that a contract is binding on both parties and that a party cannot unilaterally terminate it without the consent of the other party. The Court also held that a party cannot transfer their rights under a contract to a third party without the consent of the other party. This ruling established the principle that a contract is binding on both parties and that a party cannot unilaterally terminate it without the consent of the other party.

In Rodd v. Heartt, the Supreme Court was tasked with determining whether a contract between two parties could be enforced if it had been made in violation of an existing state law. The majority opinion held that the contract should not be enforced because it violated public policy and would encourage others to break the law as well. However, Justice Field dissented from this opinion on several grounds. He argued that contracts are generally enforceable unless they violate some fundamental principle of justice or morality; he further noted that there is no evidence suggesting that enforcing this particular contract would lead to any harm or injustice for anyone else besides those directly involved in making it. Additionally, Field pointed out that by refusing to enforce such contracts, courts may actually create more problems than they solve by encouraging people to disregard laws without consequence and thus undermining respect for them altogether.