The Metropolis by Upton Sinclair

When Allan Montague arrives in New York, he is swept into the lifestyle of the fashionable. The longer he stays in New York, the more he realizes that there is a huge disparity between the classes. When an injustice befalls the poor, Allan is the first to fight for what is right. But as he continues his lawsuit, he begins to realize that the very people he’s fighting with are the very people who rule New York. He must be wily and careful if he is to survive this pursuit of justice.