Elisabeth Wood's account of insurgent collective action in El Salvador is based on oral histories gathered from peasants who supported the insurgency and those who did not, as well as on interviews with military commanders from both sides. She explains how widespread support among rural people for the leftist insurgency during the civil war in El Salvador challenges conventional interpretations of collective action. Those who supplied tortillas, information, and other aid to guerillas took mortal risks and yet stood to gain no more than those who did not.