18 U.S.C. § 19: Petty offense defined

As used in this title, the term “petty offense” means a Class B misdemeanor, a Class C misdemeanor, or an infraction, for which the maximum fine is no greater than the amount set forth for such an offense in section 3571(b)(6) or (7) in the case of an individual or section 3571(c)(6) or (7) in the case of an organization.