"The State-form" constitutes a climax in the intellectual production of Antonio Negri. Throughout its pages, the well-known Italian thinker addresses, with his usual solid and seamless argument, a number of key issues to define the politics of the future: What is the State? What are the models of political legitimacy, of production of legal norms and of constitutional definition in today's capitalist societies? What is a constitution? What are the political parties for today? All this, with the figures of Keynes and Marx in the background.