The <a href="https://en.wikipedia.org/wiki/United_States_Congress" id="mwdQ" rel="mw:WikiLink" title="United States Congress">United States Congress</a> passes the <a href="https://en.wikipedia.org/wiki/Mann_Act" id="mwdg" rel="mw:WikiLink" title="Mann Act">Mann Act</a>, which prohibits interstate transport of women or girls for "immoral purposes"; the ambiguous language would be used to selectively prosecute people for years to come.