Amnesty International is seriously concerned for the safety of members of the Unión Sindical Obrera (USO), Oil Workers Trade Union, after an e-mail death threat was sent to the USO branch office in Cartagena, Bolívar Department on 6 May 2003 by the army-backed paramilitary group Autodefensas Unidas de Colombia (AUC), United Self Defense Forces of Colombia.
