[CZB]

how did this become a Federal crime

Interstate Commerce Clause?

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IRS probe referred to FBI. Where’s the money coming from? Where’s it going? Wonder if “Eliot Ness” ever heard of Al Capone?

[ApplegateRanch]

IRS probe referred to FBI. Where’s the money coming from? Where’s it going? Wonder if “Eliot Ness” ever heard of Al Capone?

I thought the question was, "how did this [Mann Act] become a federal crime?"; not, "how did this [case] become a federal crime."

Hence, my Interstate Commerce Clause? answer.