The materials in this collection include original photographs, reproductions from books, pamphlets, periodicals, and photoreproductions of engravings, drawings, and cartoons concerning radicalism and the trade union movement in Europe and the United States. The vast majority of the images are portraits of individuals including Eugene Debs, Morris Hillquit, Rose Schneiderman, Karl Kautsky, Algernon Lee, James Hudson Maurer, Rose Pastor Stokes and Norman Thomas. The remainder of the collection includes a wide (if sometimes idiosyncratic) variety of images, including strikes, demonstrations, Socialist Party, and other radical left organizations' events and celebrations, workers' summer resorts, women and minority workers, and sweatshops.