A bill of attainder is a law that picks out a specific person or an identifiable group, declares them guilty of something, and imposes a penalty on them without any trial. The U.S. Constitution forbids these laws at both the federal and state level because they let a legislature do the job of a court: decide who is guilty and hand down the punishment. The framers had watched the English Parliament use attainder bills as political weapons and wrote the ban into the original text of the Constitution, before the Bill of Rights was added.
Where the Ban Comes From
Two clauses carry the prohibition. Article I, Section 9, Clause 3 bars Congress from passing any bill of attainder.1Constitution Annotated. Article I, Section 9, Clause 3 – Powers Denied Congress Article I, Section 10, Clause 1 applies the same bar to every state legislature.2Constitution Annotated. Article I, Section 10, Clause 1 No legislature in the United States, federal or state, may legislate a named person or a closed group into guilt.
The reason is structural. The Supreme Court has described the clause not as a narrow technical rule but as “a general safeguard against legislative exercise of the judicial function, or more simply — trial by legislature.”3Legal Information Institute. Bills of Attainder Doctrine Legislatures write general rules. Courts apply those rules to individuals. A bill of attainder collapses that line.
The prohibition is not limited to the harshest penalties. In English practice, “bill of attainder” referred to a legislative act imposing death on a named person, while a “bill of pains and penalties” imposed lesser punishments like banishment or loss of political rights.4Legal Information Institute. Historical Background on Bills of Attainder The Supreme Court settled early, in Cummings v. Missouri (1867), that the constitutional ban covers both: “Within the meaning of the Constitution, bills of attainder include bills of pains and penalties.”5Justia U.S. Supreme Court Center. Cummings v. Missouri, 71 U.S. 277 (1867) Severity does not control; targeting and punishment without trial do.
The Three Elements
Courts look for three features together. The act must be legislative, it must single out specific individuals or an identifiable group, and it must impose punishment without a judicial trial.6Legal Information Institute. Bill of Attainder Miss any one of them and the challenge fails. A law that burdens everyone equally is not an attainder. A law that names someone but imposes no penalty is not either. All three elements have to line up.
Singling Out Specific People
The law does not have to name anyone, though some bills of attainder have. It is enough that the group is “easily ascertainable.” In United States v. Lovett (1946), Congress named three federal employees and cut off their salaries.7Justia U.S. Supreme Court Center. United States v. Lovett, 328 U.S. 303 (1946) In United States v. Brown (1965), the statute named no one but made it a crime for any member of the Communist Party to serve as a union officer, pointing to a fixed group defined by past affiliation.8Justia U.S. Supreme Court Center. United States v. Brown, 381 U.S. 437 (1965) Both laws were struck down.
The dividing line is between a rule that describes conduct anyone might engage in and a rule that uses past behavior or status as a label for a closed set of people. “Anyone who commits fraud loses their license” is a general rule. “Anyone who belonged to Organization X during 2024 loses their license” singles out a group that is already fixed.
Punishment Without a Trial
The people targeted never get into court. No hearing, no evidence, no opportunity to answer. The legislature acts as prosecutor, judge, and jury at once.6Legal Information Institute. Bill of Attainder That is the core abuse the clause was written to stop.
What Counts as “Punishment”
Most bill of attainder cases turn on this element. Punishment reaches well beyond prison and fines. Barring someone from a profession, cutting off government pay, and confiscating property have all been found to qualify. But not every burden a law imposes is punishment. In Nixon v. Administrator of General Services (1977), the Supreme Court laid out three factors courts weigh.9Justia U.S. Supreme Court Center. Nixon v. Administrator of General Services, 433 U.S. 425 (1977)
- The historical test asks whether the burden is one that has traditionally been treated as punishment. Imprisonment, banishment, and employment bans fall within that history.
- The functional test asks whether the burden can reasonably be explained by a legitimate, non-punitive purpose. A valid regulatory goal, even one that imposes a heavy cost, can push a law outside the clause.
- The motivational test asks what the legislative record shows. Floor statements, committee reports, and other legislative history can reveal an intent to punish specific people rather than solve a policy problem.
A law does not have to flunk all three to be an attainder, but challengers who can point to all three have the strongest cases. Courts also consider whether Congress could have reached its goal through less burdensome means; if a lighter tool would have worked, the choice of a heavier one aimed at specific people looks more like punishment.
Laws That Have Been Struck Down
The Supreme Court has invalidated laws as bills of attainder only a few times. The common thread is a legislature using statute to settle scores with people it considered disloyal or dangerous.
Cummings v. Missouri (1867) and Ex Parte Garland (1866)
After the Civil War, Missouri amended its constitution to require anyone seeking a professional license, including clergy, to swear an oath that they had never supported the Confederacy. People who could not truthfully take the oath were locked out of their professions. The Supreme Court struck the requirement down as a conditional punishment: swear the oath or lose your livelihood.5Justia U.S. Supreme Court Center. Cummings v. Missouri, 71 U.S. 277 (1867) A parallel federal oath required of attorneys practicing in federal court fell in Ex parte Garland on the same reasoning.
United States v. Lovett (1946)
During World War II, Congress attached a rider to an appropriations bill naming three federal employees and barring any government money from being used to pay them. The Supreme Court called it a textbook bill of attainder: a legislative act punishing named individuals without a trial. The purpose, the Court said, was to keep the men out of federal service permanently because of their political beliefs.7Justia U.S. Supreme Court Center. United States v. Lovett, 328 U.S. 303 (1946)
United States v. Brown (1965)
Congress made it a federal crime for any Communist Party member to serve as an officer or employee of a labor union. The Court struck the law down, rejecting the argument that it was merely preventive. Protecting unions from subversion was a legitimate goal, but Congress had tried to reach it by designating specific people rather than writing a rule of general application. Congress, the Court said, “cannot specify the people upon whom the sanction it prescribes is to be levied.”8Justia U.S. Supreme Court Center. United States v. Brown, 381 U.S. 437 (1965)
When Challenges Fail
Most bill of attainder challenges lose. The reasons mark the practical edges of the doctrine.
Laws that regulate ongoing conduct generally survive. In Communist Party v. Subversive Activities Control Board (1961), the Court upheld a registration requirement for Communist-affiliated organizations because an organization could escape the requirement by changing its present activity. “So long as the persons who engage in the regulated conduct can escape regulation merely by altering the course of their own present activities, there can be no complaint of an attainder.”10Legal Information Institute. Communist Party of the United States v. Subversive Activities Control Board, 367 U.S. 1 (1961)
Laws with a genuine regulatory purpose also tend to survive even when they name a single person. In Nixon, Congress placed former President Nixon’s presidential recordings and materials in government custody after Watergate. He challenged the statute because it named him. The Court held that he was a “legitimate class of one,” because he was the only former president whose materials were at risk of destruction, and that the law served real non-punitive goals: preserving evidence for ongoing prosecutions and protecting the historical record. The legislative history showed no intent to punish.9Justia U.S. Supreme Court Center. Nixon v. Administrator of General Services, 433 U.S. 425 (1977)
Burdens that are not permanent generally fail the historical test. In Selective Service System v. Minnesota Public Interest Research Group (1984), the Court upheld a law denying federal student aid to young men who had not registered for the draft. A non-registrant could sign up at any time and become immediately eligible again. Because the door stayed open, the Court found the law was not punitive.11Legal Information Institute. Selective Service System v. Minnesota Public Interest Research Group, 468 U.S. 841 (1984)
How It Differs From an Ex Post Facto Law
Both prohibitions sit next to each other in Article I, and they can overlap, but they attack different problems. A bill of attainder is about who the legislature targets: it singles out specific people and punishes them without a trial. An ex post facto law is about when the conduct happened: it criminalizes behavior retroactively or raises the penalty after the fact.
A single law can violate both. The loyalty oath cases did; they targeted an identifiable group and punished them for conduct that was lawful when it took place. Many laws violate only one. A generally applicable law that retroactively increases a sentence is an ex post facto problem but not an attainder, because no one is singled out. A statute naming a specific person and stripping their current benefits may be an attainder without being ex post facto, because it does not reach backward.
Bringing a Challenge
Anyone targeted by a law they believe is a bill of attainder can challenge it in federal court. The challenger has to show all three elements: a legislative act, specific targeting, and punishment without a trial. The punishment question is analyzed under the Nixon framework, looking at history, function, and legislative intent.
If a court agrees, the remedy is simple: the offending provision is struck down as unconstitutional and becomes unenforceable, and any penalty it imposed is void.12Constitution Annotated. Bills of Attainder Doctrine Successful challenges remain rare. Courts are reluctant to probe legislative motives, and the Supreme Court has said that “only the clearest proof” can establish that a law is a bill of attainder. If a plausible non-punitive purpose exists, the law will almost always stand.