Bill of attainder

A special legislative enactment that imposes a death sentence without a judicial trial upon a particular person or class of persons suspected of committing serious offenses, such as Treason or a felony.

A bill of attainder is prohibited by Article I, Section 9, Clause 3 of the Constitution because it deprives the person or persons singled out for punishment of the safeguards of a trial by jury.

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bill of attainder n. a legislative act which declares a named person guilty of a crime, particularly treason. Such bills are prohibited by Article I, Section 9 of the Constitution.

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BILL OF ATTAINDER, legislation, punishment. An act of the legislature by which one or more persons are declared to be attainted, and their property confiscated.
     2. The Constitution of the United States declares that no state shall pass any bill of attainder.
     3. During the revolutionary war, bills of attainder, and ox post facto acts of confiscation, were passed to a wide extent. The evils resulting from them, in times of more cool reflection, were discovered to have far outweighed any imagined good. Story on Const. Sec. 1367. Vide Attainder; Bill of Pains and Penalties.