
The concept of federal common law in the United States is complex and has evolved over time. Federal common law refers to legal rules developed by federal courts rather than state courts. While federal common law exists in certain areas, it is limited in scope due to the Supreme Court decision in Erie Railroad v. Tompkins (1938), which held that federal courts must apply state law in diversity jurisdiction cases, overturning the previous doctrine established in Swift v. Tyson. This decision recognised the divergence of state common laws and aimed to prevent forum shopping, where litigants exploit federal courts to have cases decided under federal common law instead of state law. The Erie decision established that there is no federal general common law, emphasising the primacy of state laws in certain contexts. However, federal common law still applies in areas where Congress has granted courts the power to develop substantive law and where it is necessary to protect uniquely federal interests. This dynamic interplay between federal and state law continues to shape the legal landscape in the United States.
| Characteristics | Values |
|---|---|
| Definition | Federal common law is a term of United States law used to describe common law that is developed by federal courts instead of the courts of individual states. |
| History | Until 1938, federal courts in the US followed the doctrine set forth in the 1842 case of Swift v. Tyson. |
| In the case of Erie Railroad v. Tompkins (1938), the Supreme Court overturned Swift v. Tyson, holding that federal courts must apply the substantive laws of the states in which they are located. | |
| In United States v. Hudson (1812), the Supreme Court held that federal courts could not define new common law crimes and that a constitutionally valid statute must define federal crimes. | |
| In Clearfield Trust Co. v. United States (1943), the Court recognized that federal courts could create federal common law in limited circumstances where federal or Constitutional interests are at stake and Congress has not adequately addressed the issue. | |
| Nature of Federal Common Law | Federal common law operates only when something has displaced or restricted the state's lawmaking powers. |
| Federal common law is based on judicial decisions rather than statutes. | |
| Federal common law is subject to alteration by Congress. | |
| Federal common law is not mentioned in the US Constitution, and its use is not prescribed for any state. | |
| Federal common law is limited to specific areas, such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. | |
| Federal common law is not recognized as broadly at the federal level as it is at the state level. |
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What You'll Learn

The Supreme Court decision in United States v. Hudson (1812)
In United States v. Hudson (1812), the Supreme Court held that federal courts could not define new common-law crimes. The case involved a libel indictment against the owners of the Connecticut Courant, Barzillai Hudson and George Goodwin, who had published an article alleging that the President and Congress had secretly voted to give $2 million to Napoleon Bonaparte in exchange for permission to make a treaty with Spain. The defendants argued that there was no federal criminal law passed by Congress that could be enforced, and the Supreme Court agreed, overturning their conviction for seditious libel.
The Supreme Court's decision in United States v. Hudson was based on the interpretation of the Constitution and the nature of the federal courts' jurisdiction. The Court reasoned that since the lower federal courts were created by Congress, their jurisdiction should be limited to specific acts specified by Congress. The Court held that "The legislative authority of the Union must first make an act a crime, affix a punishment to it, and declare the Court that shall have jurisdiction of the offence." In other words, for a federal crime to be punishable, there must be a constitutionally valid statute defining the offense, the jurisdiction of the federal courts, and the penalties.
The decision in United States v. Hudson had significant implications for the role of federal courts in defining common-law crimes. It established the principle that federal courts could not convict defendants for common-law crimes unless Congress had specifically defined the crime and its penalties. This case effectively closed the door on the lower federal courts' powers to convict defendants for common-law crimes, shifting the authority to define criminal jurisdiction to Congress.
However, it is important to note that the United States v. Hudson decision did not entirely eliminate the concept of common-law crimes. The Court recognized certain implied powers of the courts, such as punishing litigants for contempt of court and enforcing court orders. Additionally, while the decision limited the federal courts' jurisdiction over common-law crimes, it did not prohibit state courts from defining and prosecuting common-law offenses, although such cases have become rare.
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Federal common law is subject to alteration by Congress
Federal common law is a term used to describe common law that is developed by federal courts, instead of the courts of individual states. Common law is derived from judicial decisions instead of statutes.
The Supreme Court decision in United States v. Hudson (1812) held that federal courts could not define new common law crimes. Instead, a constitutionally valid statute must define the offense, jurisdiction, and penalties for federal crimes. This highlights the role of Congress in shaping federal common law.
Congress often lays down broad mandates with vague standards, leaving room for interpretation by the courts. These interpretations can lead to complex understandings of Congress's original intent, informed by the courts' sense of justice. While federal common law exists in limited areas, it is primarily applied when federal or Constitutional interests are at stake, and Congress has not adequately addressed the situation.
The legitimacy of federal common law is a subject of debate. Some argue that every rule of decision with the status of federal law must be traced to a written federal enactment, either directly establishing the rule or authorizing the judiciary to do so. However, others take a broader view, acknowledging that federal common law can fill gaps when the Constitution, a federal statute, or a treaty prevents state law from providing a resolution.
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The Erie Railroad Co. v. Tompkins decision
In 1938, the Erie Railroad Co. v. Tompkins decision was a landmark US Supreme Court ruling that overturned nearly a century of federal civil procedure case law. The case centred around a negligence claim made by Harry Tompkins against the Erie Railroad Company after one of their trains struck him, resulting in severe injuries and the amputation of his arm. Tompkins, a resident of Pennsylvania, chose to file his lawsuit in a federal court in New York, where the company was incorporated, instead of a state court in Pennsylvania or New York. This was likely an instance of forum shopping, as Tompkins may have believed he had a stronger chance of success in New York.
At the trial, lawyers for the Erie Railroad Company argued that Pennsylvania law should govern Tompkins's negligence claim. They cited prior decisions of the Supreme Court of Pennsylvania, which held that under state law, a person walking along a railroad right-of-way was a trespasser, and the railroad could only be held liable for negligence if it was "wanton" or "wilful". Tompkins, on the other hand, denied the existence of such a rule and contended that the railroad's duty and liability should be determined by federal courts under general law, as there was no relevant statute in Pennsylvania.
The ruling emphasised that it was not intended to strike down any federal laws but rather to assert that previous interpretations had invaded rights reserved by the Constitution for the states. This decision set a precedent for future cases, with federal courts following the precedents set by each state's highest court regarding the content of its unwritten law. However, it's important to note that federal common law still governs specific areas, such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights.
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Federal common law is limited to specific circumstances
Federal common law is a term of United States law used to describe common law developed by federal courts instead of the courts of individual states. Federal common law is limited to specific circumstances, and there are several reasons for this.
Firstly, federal common law is restricted to areas where Congress has explicitly given the federal courts the power to develop substantive law. These areas include admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. In these cases, Congress provides broad mandates with vague standards, which the federal courts then interpret and apply.
Secondly, federal common law is also limited to situations where a federal rule of decision is necessary to protect uniquely federal interests. This means that federal common law is applied when there is a conflict between federal and state law, and the federal government's exclusive domain must be protected. For example, in the 1943 case of Clearfield Trust Co. v. United States, the Court recognized the ability of federal courts to create federal common law when federal or Constitutional interests were at stake and Congress had not adequately addressed the issue.
Additionally, the Supreme Court decision in United States v. Hudson (1812) held that federal courts could not define new common law crimes. Instead, for a federal crime to be prosecutable, there must be a constitutionally valid statute defining the offense, jurisdiction, and penalties. This further limits the scope of federal common law.
The legitimacy of federal common law is a subject of debate, with some commentators advocating for restrictive approaches. Justice Scalia, for example, stated that in federal courts, there is "no such thing as common law".
In conclusion, while federal common law does exist in the United States, it is limited to specific circumstances where Congress has granted power to the federal courts or where uniquely federal interests must be protected. Federal common law is applied in conjunction with state law and is subject to alteration by Congress.
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The US Constitution does not require states to use common law
The US Constitution grants Congress the authority to establish and disestablish inferior courts and make laws, including laws governing law interpretation. While Congress can pass laws that carry out other constitutional powers, it cannot invade the executive or judicial powers. For instance, Congress can enact a statute changing the role of precedent in the judicial system or eliminating aspects of common law. However, a concrete proposal to limit the power of courts to just "applying law" would be challenging to draft and could be struck down by the Supreme Court as beyond Congress's power.
Federal common law refers to common law developed by federal courts rather than state courts. While federal common law continues to govern in certain areas, such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights, federal courts generally apply state law as the substantive law in cases involving parties from different states. The Supreme Court's decision in Erie Railroad v. Tompkins in 1938 held that federal courts exercising diversity jurisdiction must use the same substantive laws as the courts of the states in which they are located, overturning the previous doctrine established in Swift v. Tyson.
The principle that federal law is subject to alteration by Congress is reflected in the US Constitution, which vests legislative powers in the US Congress, consisting of the Senate and the House of Representatives. This allows for the creation and alteration of laws at the federal and state levels, demonstrating the dynamic nature of the US legal system.
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Frequently asked questions
There is a limited body of federal common law, which refers to rules created and applied by federal courts in the absence of any controlling federal statute. However, the US Constitution does not require states to use common law, and federal common law only operates when something has displaced or restricted the states' lawmaking powers.
In 1812, the Supreme Court held that federal courts could not define new common law crimes. In 1842, the Supreme Court held that federal courts hearing cases between parties from different states did not have to apply the common law developed by state courts. This decision was overturned in 1938, with the ruling that federal courts must apply the same substantive laws as the courts of the states in which they are located.
Federal common law continues to govern in areas where Congress has given the courts power to develop substantive law and where a federal rule of decision is necessary to protect uniquely federal interests. This includes admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights.








































