Olga winced as she drew back the bandage on her right breast, revealing an infected puncture wound that hadn’t healed since a man bit her in a fit of sexual rage. But the wound, for which the 19-year-old Moldovan lacked even basic medicine, is only a small part of Olga’s daily agony. For more than a year she has been held as a sex slave in this town in western Macedonia, where human trafficking...