There are literally hundreds indictments and cases involving illegal gambling and finaincal crimes relating to sports betting by the US Government. Here is a couple of them:
https://www.justice.gov/opa/pr/one-world-s-largest-digital-currency-companies-and-seven-its-principals-and-employees-charged
Here is another major case, like I said literally hundreds of them, right down to some regular citizens (John Doe wagering off the internet) that participated in sports wagering doing hundreds of transactions, etc.:
https://www.justice.gov/opa/pr/leader-illegal-international-gambling-enterprise-convicted-conspiracy-commit-money-laundering