Allende Massacre

Los Zetas systematically destroyed the town of Allende, Coahuila, killing an estimated 300 people and demolishing dozens of homes and businesses. The massacre was triggered when DEA intelligence about Zetas informants was leaked to compromised Mexican police, who passed it to Zetas leadership.

The Zetas retaliated not only against the suspected informants but against their entire extended families and anyone connected to them. Bodies were incinerated in industrial ovens. The Mexican government covered up the massacre for years.

ProPublica’s landmark 2017 investigation revealed how US intelligence-sharing with Mexican authorities, without adequate safeguards against corruption, directly precipitated the atrocity. The case exemplifies how counter-narcotics cooperation can produce catastrophic unintended consequences when institutional corruption is not accounted for.