Alleged gang members set to appear in federal court are in Alexandria , Virginia . Charges against Underground Railroad Crips include underage sex trafficking , officials say . Arrests include those of six other gang members in the past year and a half , officials say . Officials : The investigation began in September 2011 , but an affidavit lists alleged crimes by the reputed gang members dating back to 2006 . At least 10 youths ages 16 to 18 were recruited , were arrested if they tried to leave .
Alleged gang members set to appear in federal court are in Alexandria , Virginia . Charges against Underground Railroad Crips include underage sex trafficking , officials say . Arrests include those of six other gang members in the past year and a half , officials say . Officials : At least 10 youths ages 16 to 18 were recruited , were arrested if they tried to leave .