Introduction: activist class cultures as a key to movement building -- Why look through a class lens? : five stories through three lenses -- Applying class concepts to US activists -- Four class categories of activists and their typical group troubles -- Movement traditions and their class cultural troubles -- Where is everybody? : approaches to recruitment and group cohesion -- Class speech differences I : humor and laughter -- Activating the inactive : leadership and group process solutions that backfire -- Class speech differences II : abstract and concrete vocabulary -- Class speech differences III : racial terms -- Diversity ironies : clashing anti-racism frames and practices -- Class speech differences IV : talking long, talking often -- Overtalkers : coping with the universal pet peeve -- Class speech differences V : anger, swearing, and insults -- Activists behaving badly : responses to extreme behavior violations -- Class speech differences VI : missing class talk -- Conclusion : building a movement with the strengths of all class cultures.