What were the leaders of Political Machines called?

This system of political control—known as "bossism"—emerged particularly in the Gilded Age. A single powerful figure (the boss) was at the center and was bound together to a complex organization of lesser figures (the political machine) by reciprocity in promoting financial and social self-interest.

Urban growth invariably feeds increased commercialization and industrialization. it requires continually expanding land areas. when urbanization rates are high, and countries do not have the institutional and managerial capacities or economic wherewithal to manage such rapid growths, they exert intense pressure on the types and nature of the resulting settlements. they contribute to the development of overcrowded slums and shanty towns without adequate essential services and necessary infrastructure.-by asit k. biswas and cecilia tortajada