In recent years, citizen-run anti-crime organizations have brought important challenges to Mexico and other Latin American countries. Under what circumstances are citizens more likely to seek out their neighbors to confront crime directly? I argue that when citizens do not trust state authorities, their perception of the trustworthiness of their community can increase their likelihood of engaging in anti-crime organization attempts. I analyze data from Mexico and find that an average citizen's perception of the trustworthiness of his/her neighbors correlates with his/her likelihood of engaging in an anti-crime organization attempt. Further, consistent with the main argument of this paper, I find this link to be stronger among those who distrust the police. These findings contribute by bringing back citizens' relation to the state as an important moderating force in society, and helping us understand when social trust can translate into controversial forms of state substitution.En los últimos años organizaciones anti-criminales han generado importantes desafíos para México y otros países latinoamericanos. ¿Bajo qué circunstancias buscan los ciudadanos unirse a su comunidad para enfrentar al crimen directamente? En este artículo propongo que, en contextos en los que los ciudadanos desconfían de sus autoridades de procuración de justicia, su confianza interpersonal se traduce en una mayor disposición a buscar defenderse directamente del crimen de forma colectiva. Para poner esta idea a prueba analizo datos de México. Encuentro que, en efecto, la confianza interpersonal se correlaciona positivamente con la probabilidad de un ciudadano promedio busque asociarse con sus vecinos para defenderse del crimen. Más aún, en línea con el argumento principal de este texto, encuentro que el vínculo entre estas dos variables es más fuerte entre quienes desconfían de la policía. Estos hallazgos contribuyen trayendo de vuelta al estado como una fuerza moderadora en la sociedad. En efecto, una fuerza que determina cuando la confianza social puede traducirse en formas controversiales de sustitución estatal.Over the last ten years, Mexico and other countries in Latin America have gone through a deep crisis of insecurity (Bisogno et al. 2014). To cope with this crisis, some individuals have reached out to their neighbors in attempts to form stable or ephemeral organizations to address their concerns about crime. 1 Although not all of these attempts have been successful, the ones that have pose a threat to the rights, lives, and livelihoods of alleged criminals, innocent bystanders, and vigilantes themselves (Bates, Greif, and Singh 2002;Hine 1998). Just months before this piece was written, for example, two surveyors working for a polling firm were confused for kidnappers and burned alive by citizens of a small town in Puebla (central Mexico). 1 In the pages that follow, I will call this type of behavior an anti-crime organization attempt.