Mann Act
According to historian Mark Thomas Connelly, a group of books and pamphlets appeared announcing a startling claim: There was a conspiracy, which trapped white girls, seduced them, and forced them into prostitution, or 'white slavery'. These stories started around 1909.  They often wrote about innocent girls "victimized by a huge, secret and powerful conspiracy controlled by foreigners", as they were drugged or imprisoned and forced into prostitution.