“Your days are running out f******g REVOLUTIONARY. Today we have your sister under surveillance. She is wearing black trousers and a white shirt. It is going to be easier than we thought”. This is typical of the threats received by Fredy Peccerelli Director of FAFG the Guatemalan Forensic Anthropology Foundation which carries out exhumations of mass graves to return the victims to their families and to find evidence which will bring the perpetrators to justice.