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.