white slave

plural white slaves

1. A woman (of European descent) sold into prostitution, especially when transported to a country primarily inhabited by nonwhites.

   1 more example

   “I see. And you’re now going to tell me that Bertha Gotobed was got hold of by the White Slave people.” “How did you know?” asked Parker, a little peevishly. “Because Scotland Yard have two maggots which crop up whenever anything happens to a young woman. Either it’s White Slavery or Dope Dens⁠—sometimes both. You are going to say it’s both.”

   1927, Dorothy Sayers, Unnatural Death