Jeremy Crampton has an interesting post at Open Geography about the links between Walter Christaller and Nazism. It begins with a link to an important paper by Trevor Barnes and Claudio Minca on Christaller and Carl Schmitt forthcoming in the Annals of the AAG (available online, but requires subscription) and then provides some discussion and links to a range of other geographers including William Bunge, Fred Schaefer and Richard Hartshorne. Jeremy has some interesting documentary material to add to the story.