The document summarizes key developments in the American labor movement between 1870 and the early 20th century. It discusses the changing composition of the labor force, including the use of child labor. It also outlines the growth of labor organizations like the Knights of Labor and strategies used by management to oppose unions, such as Pinkerton agents and injunctions against strikes. Major events that shaped the movement are noted, including the Great Railroad Strike of 1877 and the Haymarket Riot of 1886. The founding of the American Federation of Labor in 1886 and its goals are summarized.