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Ex parte Garland was a significant U.S. Supreme Court case decided in 1867. The Court ruled that the U.S. Constitution prohibits Congress from passing bills of attainder, which are legislative acts that declare a person guilty of a crime and impose punishment without a judicial trial.1

The case involved Augustus Garland, a lawyer who had been a Confederate sympathizer. He sought to practice law in federal court but was prevented by a loyalty oath required by Congress after the American Civil War. The Supreme Court found this oath unconstitutional, as it functioned as a bill of attainder by imposing punishment (disqualification from a profession) without due process. This ruling affirmed that individuals cannot be retroactively punished or barred from their professions based on past associations or actions without a proper trial.1

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