I am sure they are, as The Child Support Recovery Act of 1992 and the Deadbeat Parents Punishment Act of 1998 make willful failure to pay child support a federal offense if the amount owed exceeds $5,000. - https://legalclarity.org/if-a-father-doesnt-pay-child-support-does-he-still-have-rights/
Yet a recent piece by NPR notes that 32 percent of fathers fail to receive child support payments from delinquent mothers, while only 25 percent of mothers are awaiting late payments from fathers.- https://www.joelwanders.com/articl/new-report-finds-mothers-more-likely-to-skip-child/
Ah, that means that child support that has been court ordered.