sentences:  The ERG has engaged in kidnapping in the past.On February 9, 2007, a Colombian National Army captain held hostage for three years by the group was freed.Olimpo de Jesús Sánchez Caro-
  
  Olimpo, known as El Viejo, as long as 19 members of the group demobilized in the city of Carmen Del Choco on August 21, 2008.