The organizers are being paid by Dept. of Justice Secy. Holder, under the community relations leadership of Grande Lum:  http://www.mainjustice.com/2011/10/14/grande-lum-chosen-as-director-of-doj-community-relations-service/

Here is the Ferguson Mayor point of 2 DOJ activists:  http://dailycaller.com/2014/08/14/ferguson-mayor-two-doj-protest-marshals-in-town/#ixzz3AMq73UIG

The point is to manipulate public opinion with federal agents  to increase fear that will be used to further restrict civil liberties and freedom in the name of "safety & security".