Political Extremism and Radicalism in the Twentieth Century is a compilation of rare and unique archival collections covering a wide range of fringe political movements. The collections cover the 1900s to the 2010s when the world saw the formation of several civil rights movements for the rights of minorities, women's rights, and gay rights. It also encompasses the rise and fall of a number of peripheral groups deemed ‘extreme’ or ‘radical’ by contemporaries, such as anti-Catholic, anti-Semitic, anti-war, communist or socialist, creationist, environmentalist, hate, Holocaust denial, new left, survivalist, white supremacist, and white nationalist. The archive is global in scope but presents materials largely from the US and Britain and showcases important factions from Europe and Australia, such as the Norwegian Nazi Party and the Australian National Socialist Party.