It's in the title. If you don't know how this works just from the title I can't help you.
Powers denied to Congress are as follows:
- Can not deny any rights listed in the Bill of Rights.
- Suspend the Writ of habeas corpus, which determines if a convicted person has been illegally detained.
- Pass Bills of Attainder–laws that establish guilt and punish without a trial.
- Pass Ex Post Facto laws, or make crimes of acts that were legal when they were committed.