Group leaders made money off own members selling robes, imposing fees
Even during its 1920s heyday, the Ku Klux Klan wasn't a very effective hate group, according to an analysis by Harvard economist Roland G. Fryer and Steven D. Levitt, the latter of Freakonomics
fame. However, the Klan was
a "wildly successful" pyramid scheme, according to a Priceonomics blog...