Political extremism and radicalism in the twentieth century is a compilation of archival collections covering a wide range of fringe political movements. It has been sourced from libraries and archives across the world. Covers a broad assortment of both far-right and left political groups. It offers a mixture of materials, including periodicals, campaign propaganda, government records, oral histories, and various ephemera, which allow researchers to explore unorthodox social and political movements. The collections cover the 1900s through 2010s.