What powers are denied to congress by the constitution?

congress cannot: # pass a law that turns an act into a crime after the act was committed # accept a title of nobility # suspend writ of habeas corpus(except under special circumstances) # pass a Bill of Attainder. which means they can't punish anyone or group without a trial # tax any goods exported from any state # neither the Senate or the House can adjourn or move location without the consent of the other. # and congress cannot vote themselves a pay raise during their term in office. =-)