Evidence uncovered by Kate Doyle, a researcher at the non-profit National Security Archive has proven crucial in several recent human rights trials in Latin America.

Doyle tells host Lisa Mullins how documents that originate within the US government are establishing culpability for crimes committed by former American allies in Peru, Guatemala and El Salvador.

Doyle, along with Fredy Peccerelli, the forensic anthropologist of the Fundación de Antropología Forense de Guatemala, have won the 2012 Abraham Lincoln Brigade Archive (ALBA) and Puffin Foundation Award for Human Rights Activism.