Consists of 154 pamphlets related to the socialist movement in the United States, circa 1889-1934. The collection has a particular depth of materials created by the Socialist Party of the United States and affiliated but independent publishers, such as Charles H. Kerr Publishing Company. Topics represented in this collection include anti-capitalism, class struggle, incarceration, the Tom Mooney case, monetary reform, anti-fascism, and collective farming.

Pamphlets on the topics of employment of women during World War II, socialism and anarchism, voting rights, civil rights, farm labor, and trade unionism.

The bulk of the collection is print material, primarily pamphlets and newsletters relating to the Industrial Workers of the World (IWW). The earliest item is the pamphlet, "The Pullman Strike," by Rev. William H. Carwardine, 1894. The most contemporary is the minutes of the Twenty-Second Constitutional Convention of the Industrial Workers of the World, Chicago, Nov. 9-16, 1936.