ANSWER vs. UFPJ
Scott McLemee writes up a study of the ANSWER-UFPJ split. Conclusion:
yeah, the groups are different, but the people who go to their
demonstrations are pretty much the same.
McLemee: http://www.insidehighered.com/views/2007/09/19/mclemee
paper: http://plaza.ufl.edu/mtheaney/Coalition_Dissolution.pdf