From the FCC:
Enforcement Fines: The Collection Process | Federal Communications Commission (fcc.gov)
More clarification on how current enforcement works in this article.
Legislation introduced to strengthen FCC enforcement | TransNexus
A current summary of the process: FCC fines you, you don't pay, FCC sends the case to DOJ for POSSIBLE Civil court litigation, if DOJ refuses to take court action, the case is sent to US Treasury Offset program (TOP) where there is a federal withholding (such as IRS refund interception) to pay your debt, if no collection is successful by US Treasury, US Treasury sends it to private collections.
All are still civil, if your case happens to get to the federal civil court level by DOJ (less likely not), you have had plenty of time to move assets to a trust before service of process and the final judgment still has no teeth. But sure, go pay that federal lawyer a $10,000+ retainer (not your local court lawyer) to educate you on your rights and how to defend yourself from civil action.