What powers does congress not have list 4 of them?

Congress does not have the power to grant titles of nobility, which prevents the establishment of a hereditary aristocracy. It cannot pass ex post facto laws, meaning it cannot retroactively make actions illegal. Additionally, Congress is prohibited from passing bills of attainder, which are laws that punish individuals without a trial. Lastly, Congress cannot regulate state functions or interfere with state sovereignty without proper constitutional authority.