This document provides notes on the development of unions in the United States between the late 1800s and early 1900s. It covers reasons for the rise of industrialization, suppression of early unions by businesses, key figures like Karl Marx, "Mother Jones", and Eugene V. Debs, as well as major events such as the Great Railroad Strike of 1877 and the Haymarket Riot. Major labor organizations discussed include the Knights of Labor, the American Federation of Labor (AFL), and the Industrial Workers of the World (Wobblies). The document poses a series of questions to help guide the reader's understanding of the topics.