What was one of the power denied by the congress
One power deprived of the Congress is the ability to prohibit slave importation prior to the year 1808. Another power denied to Congress was the ability to defer habeas corpus or a right to a court trial. The Congress was also denied the aptitude to tax goods between states. Read more on http://www.ehow.com/info_8569017_important-powers-expressly-denied-congress.html.
Congress can not tax exports from the US. Farmers, back in the day they wanted their goods exported, during the time of the Constitution.