Every social movement can be thought of as either a reflection of or an intervention into a set of changing social circumstances. The Civil Rights Movement reflected the fact that the South was industrializing after World War II and so the South had to make room for a free labor market. The Civil Rights Movement also intervened to change the hearts and minds of whites in the South so that formal social segregation might be abolished. This question of whether a social movement is a reflection or an intervention is not simply the empirical one of deciding whether the movement or changed circumstances came first. Attitudes might start to change before the Civil Rights Movement made a change in attitude into a goal, and changes in legislation may indeed have been crucial in structuring a labor market already undergoing alteration. The question is a theoretical one in that it requires a re-conceptualization of the forces that might serve as either causes or effects. The idea of intervention has to be expanded to include the dynamics by which a movement defines its own purposes.