This dissertation has as its theme the spatiality of the city as a public segregation policy that engenders public security policy. Therefore, we intend to understan how the production of social space and the city is closely related to the economic model adopted and how the tensions between ethnographically diferente social groups are reproduced in the geographical space and in the city. Thus, this dissertation is subdivides into: (a) understanding of the city as a space of dispute; (b) understanding of the city as a reproduction of global capitalismo; (c) urban (re)planning policies, targeting the world city Market, which culminates i the reproduction of segregations based on class and race; (d) the analysis of Rio de Janeiro as a global city and the urban (re)planning that took place in view of the megaeven, together with the segregation of Rio de Janeiro; (e) the analysis of necrospace that culminates in the necropolitics of Public Security.