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Police militarization is prevalent worldwide. Despite growing interest in the consequences of militarization, few studies focus on its causes. Through the case of Brazilian municipal police forces, we explore the connection between partisan ideology and police militarization. Some research shows that leftist administrations in democracies are more likely to emphasize human rights and less likely to militarize the police. However, leftist administrations might militarize police forces more than centrist and right-wing parties to compensate for perceptions of lower competence to deal with security issues, especially when they face high levels of violent crime. Using inverse probability of treatment weights, we show an association between leftist mayors and higher militarization of municipal police forces. Furthermore, in contexts of high homicide rates, mayors of Brazil’s leading leftist party, the Workers' Party, tend to militarize local police more than others.
Albarracín et al. (Fri,) studied this question.