This document summarizes the growth of big business and organized labor in the United States between 1860-1900. It describes how the Second Industrial Revolution led to unprecedented growth through new technologies and transportation/communication networks. Figures like Rockefeller, Carnegie, and Morgan pioneered big businesses and trusts that dominated entire industries. Workers organized unions like the Knights of Labor for better treatment in the face of exploitation. However, strikes were often broken up violently by private militias or federal troops. The period saw ongoing conflict between big business, workers, farmers, and politicians over control of the free market system.