Robert A. Caro, The Power Broker, 1974
One of the Modern Library’s hundred greatest books of the twentieth century, Robert Caro's monumental book makes public what few outsiders knew: that Robert Moses was the single most powerful man of his time in the City and in the State of New York. And in telling the Moses story, Caro both opens up to an unprecedented degree the way in which politics really happens—the way things really get done in America's City Halls and Statehouses—and brings to light a bonanza of vital information about such national figures as Alfred E. Smith and Franklin D. Roosevelt (and the genesis of their blood feud), about Fiorello La Guardia, John V. Lindsay and Nelson Rockefeller. [Source]