Also you’re allowed to plead the fifth on the origin of the income IIRC, though honestly that’s just as likely to get you looked at by the FBI/local constabulary.
The IRS doesn’t report it to the FBI because that’s not their job. If you’re already under investigation and the FBI asks, they’ll hand over the info, but they won’t initiate anything, they just want their cut.
Also you’re allowed to plead the fifth on the origin of the income IIRC, though honestly that’s just as likely to get you looked at by the FBI/local constabulary.
The IRS doesn’t report it to the FBI because that’s not their job. If you’re already under investigation and the FBI asks, they’ll hand over the info, but they won’t initiate anything, they just want their cut.