This type of book can only be researched and written when people take long hours out of their days to speak with you at length about painful subjects. Countless former and active militants of the UP, the Communist Party, and the FARC took the time to answer my questions and help me understand the events that led to the destruction of their political party. Among these people, Álvaro Salazar, Alberto Rojas Puyo, Medófilo Medina, and Mariela Barragán met with me on numerous occasions and helped me establish links to other protagonists in the story. Special mention should also go to the Communist Party weekly, Voz, whose editor, Carlos Lozano, gave me access to its archives and photos. Several of the party's enemies were also generous enough to talk to me about why they destroyed the UP, including Carlos Castaño and some of his cohorts in the paramilitaries.
Human rights groups like Justicia y Paz and their data collectors at the Banco de Datos also greatly contributed to this effort. Lawyers' groups like the Colectivo de Abogados and the Comisión Colombiana de Juristas gave me guidance and stacks of information. The Colectivo also provided me with documents concerning Manuel Cepeda's and Wilson Borja's cases. Javier Cruz, the director of the archives at Semana magazine, provided me with hundreds of articles. Judges like Julio Ballén gave me access to sensitive judicial cases. And professors like Gonzalo Sánchez, Alejandro Reyes Posada, Medófilo Medina, and Henry Dietz gave me historical and political perspective.
I would like to thank my colleagues at Peace Brigades International-who taught me that Colombia is ambiguity and ambiguity is Colombia-and friends who work for Amnesty International and Human Rights Watch. I'm also grateful to my journalist colleagues who showed me a new world. For every "thousand pockets," "lunchbox legend," and "cyclops," there is a Martin