1 Any legislative act that imposed a sentence of death and attainder upon one or more specific individuals or groups without a trial or other judicial proceeding. 2 In United States constitutional law, any legislative act that prescribes a punishment on one or more specific individuals or groups or denies them of civil or political rights without a trial or other judicial proceeding. Such enactments are prohibited by the United States Constitution. See also attainder, bill of pains and partic...