The  central  topic  of  this  work  is  the  relationship  between  critical  knowledge  and  the  counter-hegemonic activist struggles in Belgrade, Sarajevo and Zagreb. While looking at the “cognitive background” of activism, both non-theoretical and theoretical knowledge is taken into account. The accent is nonetheless on the theoretical knowledge. Critical ideas, on the other hand, have been  inspiring  social  and  political  actions  for  centuries.  The  question  of  the  nature  of  this relationship,  including  the  mechanisms  of  diffusion,  concrete  sources  and  reasoning  behind  it, has  thus  far  remained  under -researched.  Which  type  of  knowledge  is  considered  to  be “movement relevant” today? Where does it come from, through which channels and which social,  structural  and  organizational  factors  influence  its  consolidation  and  operationalization within  social  movement  collectives?  All  these  questions  are  addressed  through  a  research conducted in a specific context of the post-socialist former Yugoslavia.