Colombian military personnel have received extensive counterinsurgency training from U.S. military and law enforcement agencies , including the School of Americas ( SOA ) . Author Grace Livingstone has stated that more Colombian SOA graduates have been implicated in human rights abuses than currently known SOA graduates from any other country . All of the commanders of the brigades highlighted in a 2001 Human Rights Watch report on Colombia were graduates of the SOA , including the III brigade in Valle del Cauca , where the 2001 Alto Naya Massacre occurred . US-trained officers have been accused of being directly or indirectly involved in many atrocities during the 1990s , including the Massacre of Trujillo and the 1997 Mapiripán Massacre
Massacre of Trujillo
Massacre of Trujillo
War on drugs