It's part of the Treasury Department. Which reports to the Attorney General.
Real Truth Archives. And especially this one Tax Evasion Video
My favorite download is the video where the comissioner of the IRS is asked a direct question as to whether or not there is a law requiring a citizen to pay income taxes. His response, and the fact that his veteran-IRS-employee sidekick has to come in to defend, is simply dumbfounding.
Go on, educate yourself. I dare you!