The limits on the powers of Congress are as follows:
1. The Congress is not allowed to pass laws post ex facto which means that the law cannot prosecute people for a something that was not considered a crime before.
2. Congress is denied the ability to pass bills of attainder meaning they are not allowed to prosecute criminals in special tribunals but only in regular court trials.
3. The Congress cannot suspend the writ of habeas corpus means that the Congress cannot deny the right of the criminals to stand before a judge and learn the charges they face that enables them to defend themselves.
