Political Extremism & Radicalism in the 20th Centuryincludes difficult to find ephemera and internal documents for the predecessors of today’s Alt-Right and Antifa. Sourced from the Hall-Hoag collection at Brown University, the American Radicalism collection at Michigan State and the British National Archives, it includes coverage of right wing and leftist organizations, people and themes there were considered ‘extreme’ at the time the material was collected: SDS, Black Panther Party, Libertarians, Socialists, John Birch Society, Fascists, Gay Liberation Movement, etc.