Abstract
While the activities of the Ku Klux Klan are central to accounts of the Civil Rights Movement, and, by extension, closely tied to the development of social movement theory since the 1960's, no previous study has been able to construct an unbiased profile of Klan membership. This paper draws on a set of 94 FBI interviews with Alabama Klansmen in 1963 and 1964 to compile a representative sample of local Klan membership and evaluate the determinants of individual participation. Using this sample, I examine the extent to which Klan adherents differed from the surrounding population, as well as the structure of bias in previous attempts to profile Klan membership. I conclude by highlighting the importance of social networks in linking individuals to reactive social movement organizations, which adds an important relational dimension to existing research focused on grievances produced by macro-level processes.