FBI agents are not paid in hourly wages, they are paid through the federal government system GS ratings which provides agents an annual salary rating for years served.
The tariff of the United States, like all actual protective tariffs, is partly revenue and partly protective, its original purpose of yielding revenue having been subordinated to that of giving protection, until it may now be best described as a protective tariff yielding incidental revenue.
The Provisional Constitution's tariff clause reads: The Congress shall have power to lay and collect taxes, duties, imposts and excises for the revenue necessary to pay the debts and carry on the Government of the Confederacy; and alt duties, imposts and excises shall be uniform throughout the States of the Confederacy.