The article provides a new proposition of thinking about such categories as a city, the urban, urban strategy and social practices connected with analytical science of the city, which is only at the outline stage, but also projected by Lefebvre himself. This turn seems necessary due to the death of traditional city and old humanism. The article is also a passionate and utopian (in positive sense of term) manifesto for democratization of right to the city consisting of cry and demand of the dispossessed from such a prerogative. The author argues that an urban strategy based on a new science of the city needs social support and political force. They will be provided by the working class, putting an end to the urban segregation.