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.
Originated in 1913, the income tax is one of them. The federal government raises revenue with the income tax, where it used tariffs prior. The Underwood Tariff Act of 1913 sought to control tariffs by reducing them and replacing lost revenue via the income tax.