This article discusses violence and mobilization in the Maré favelas in Rio de Janeiro. It notes that violence between criminal groups fighting for control of drug trafficking, and interventions by state security forces, create an oppressive climate of fear that intensifies the historic segregation faced by favela residents. In Maré, some of Rio's most powerful drug factions operate and armed conflicts and aggressive policing are common. The article describes how residents and local groups in Maré have mobilized against human rights violations following increased conflicts. It aims to debate violence in Rio and present social struggles in Maré during this period.