Political Extremism in the Twentieth Century This link opens in a new windowPrimary source material from far-right and fascist movements, alongside of radical leftist groups. Includes ephemera, election materials, government documents and oral histories from groups in the United States, Europe, and Australia including John Birch Society, Black Panther Party, Ku Klux Klan, LaRouche, anti-integration groups, neo-Nazis, Communist and anti-Communist groups, Christian Identity, British Union of Fascists, British National Party, and religious cults. Spans 1930s-21st century.