Final answer:
Congress is allowed to pass bills of attainder, but not exercise any power not enumerated in the Constitution.
Step-by-step explanation:
One action that is acceptable for Congress to exercise is passing a bill of attainder. A bill of attainder is a legislative act that declares someone guilty of a crime without a trial. However, it is important to note that the Constitution prohibits Congress from passing bills of attainder.
On the other hand, exercising any power not enumerated in the Constitution is not acceptable for Congress to do. The Constitution grants specific powers to Congress, and any powers not explicitly granted are reserved for the states or the people.
Learn more about Acceptable actions for Congress to exercise