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 Revenue Act of 1764, also known as the Sugar Act, was the first tax on the American colonies imposed by the British Parliament. Its purpose was to raise revenue through the colonial customs service and to give customs agents more power and latitude with respect to executing seizures and enforcing customs law.