(a) In general Whoever knowingly and intentionally violates, or knowingly and intentionally attempts to violate, section 6821 of this title shall be fined in accordance with title 18 or imprisoned for not more than 5 years, or both. (b) Enhanced penalty for aggravated cases Whoever violates, or attempts to violate, section 6821 of this title while violating another law of the United States or as part of a pattern of any illegal activity involving more than $100,000 in a 12-month period shall be fined twice the amount provided in subsection (b)(3) or (c)(3) (as the case may be) of section 3571 of title 18 , imprisoned for not more than 10 years, or both. ( Pub. L. 106–102, title V, § 523 , Nov. 12, 1999 , 113 Stat. 1448 .)