26 U.S. Code § 5661 - Penalty and forfeiture for violation of laws and regulations relating to wine
Whoever, with intent to defraud the United States, fails to pay any tax imposed upon wine or violates, or fails to comply with, any provision of subchapter F or subpart C of part I of subchapter A, or regulations issued pursuant thereto, or recovers or attempts to recover any spirits from wine, shall be fined not more than $5,000, or imprisoned not more than 5 years, or both, for each such offense, and all products and materials used in any such violation shall be forfeited to the United States.
Any proprietor of premises subject to the provisions of subchapter F, or any employee or agent of such proprietor, or any other person, who otherwise than with intent to defraud the United States violates or fails to comply with any provision of subchapter F or subpart C of part I of subchapter A, or regulations issued pursuant thereto, or who aids or abets in any such violation, shall be fined not more than $1,000, or imprisoned not more than 1 year, or both, for each such offense.
Prior section 5661(a) also provided for an additional penalty “of double the tax due, to be assessed, levied and collected in the same manner as taxes are collected”. See section 6651 et seq. of this title.