49 C.F.R. § 1021.2 – Enforcement claims and debtors.

(a) Enforcement claims are all separate civil penalty or forfeiture claims not exceeding $20,000 which may arise under the provisions of the Interstate Commerce Act or legislation supplementary thereto.
(b) Debtor is any person or corporation subject to civil penalties or forfeitures for violation of the provisions of the Interstate Commerce Act or legislation supplementary thereto.