Gebardi v. United States

Gebardi (defendant), unmarried, and a single woman agreed between themselves to travel by train across state lines and have sexual intercourse; both were indicted for conspiring to violate the Mann Act, which criminalized transporting an unmarried woman across state lines for that purpose. At a bench trial, no evidence supported any conspiracy involving a third person beyond the two of them, yet both were convicted, and the court of appeals affirmed; the Supreme Court granted certiorari.