executive department or agency, in writing, of any change of any material fact or intention from that previously represented, stated, or certified, immediately upon receipt of any information that would lead a reasonably prudent person to know that a change of material fact or intention had occurred or may occur in the future. (b) Civil penalties The Secretary may impose the following civil penalties on a person for each violation by that person of this Act or any regulation, order, direction, mitigation measure, prohibition, or other authorization issued under this Act: (1) A fine of not more than $250,000 or an amount that is twice the value of the transaction that is the basis of the violation with respect to which the penalty is imposed, whichever is greater. (2) Revocation of any mitigation measure or authorization issued under this Act to the person. (c) Criminal penalties (1) In general A person who willfully commits, willfully attempts to commit, or willfully conspires to commit, or aids or abets in the commission of an unlawful act described in subsection (a) shall, upon conviction, be fined not more than $1,000,000, or if a natural person, may be imprisoned for not more than 20 years, or both. (2) Civil forfeiture (A) Forfeiture (i) In general Any property, real or personal, tangible or intangible, used or intended to be used, in any manner, to commit or facilitate a violation or attempted violation described in paragraph (1) shall be subject to forfeiture to the United States. (ii) Proceeds Any property, real or personal, tangible or intangible, constituting or traceable to the gross proceeds taken, obtained, or retained, in connection with or as a result of a violation or attempted violation described in paragraph (1) shall be subject to forfeiture to the United States. (B) Procedure Seizures and forfeitures under this subsection shall be governed by the provisions of chapter 46 of title 18, United States Code, relating to civil forfeitures, except that such duties as are imposed on the Secretary of