This document discusses the history of labor unions and strikes in the United States. It describes how early unions like the Knights of Labor organized all workers to negotiate for better conditions like an 8-hour workday and the end of child labor. Other major unions included the AFL which organized local unions nationally and the IWW or "Wobblies" which took a more socialist approach. The document outlines some major strikes in US history, including the Haymarket Riot of 1886 over the 8-hour day and violence between police and strikers, the Homestead Steel Strike of 1892 where management brought in armed guards, and the Pullman Strike of 1894 where a company town wage cut led to halted railroad traffic nationwide.