The former head of a Colombian paramilitary group has returned to Colombia almost 16 years after his extradition to the US. Immigration officials and international police organization Interpol received Salvatore Mancuso, former commander of the demobilized paramilitary United Self-Defence Forces of Colombia (AUC), in Bogotá on Tuesday, according to authorities. Mancuso, who has confessed his co-responsibility for numerous massacres and has been in prison in the US since 2008 for drug trafficking, is to take on the role of “peace advocate.” Colombia suffered through a 52-year-long civil war wag…