Concept by Toni Negri, related to power relations.
"The biopolitical diagram is the space in which the reproduction of organised life (social, political) in all its dimensions is controlled, captured, and exploited – this has to do with the circulation of money, police presence, the normalisation of life forms, the exploitation of productivity, repression, the reining in of subjectivities. In the face of this, there is what I call a "political diagonal", in other words the relation that one has with these power relations, and which one cannot but have. The problem is to know what side you are on: on the side of the power of life that resists, or on the side of its biopolitical exploitation. What is at stake in the city often takes shape in the struggle to re-appropriate a set of services essential to living: housing; water, gas and electricity supply; telephone services; access to knowledge and so on." (http://www.eurozine.com/articles/2008-01-21-negri-en.html)