This report is the fruit of careful work of gathering information and of investigations done by the Human Rights Center «Fray Bartolomé de Las Casas» between July 1994 and June 1995. Special acknowlegement goes to all the people who have had the courage to denounce the violations of their human rights: peasants, indigenous people and mestizos. Many hands and eyes have participated in this document, conscious of the situation in which thousands of Chiapanecos live and of the context of violence that they confront on a daily basis. They offered their solidarity with their presence and their work. We thank all women and men who have collaborated in the civilian peace camps. This report tries to reveal the covert presence of armed civilian groups in Chiapas and alert to the dangers this is generating and the incontrollable situation it could produce.