Why do radical movements and spaces sometimes feel laden with fear, anxiety, suspicion, self-righteousness, and competition? Montgomery and bergman call this phenomenon rigid radicalism: congealed and toxic ways of relating that have seeped into social movements, posing as the “correct” way of being radical. In conversation with organizers and intellectuals from a wide variety of political currents, the authors explore how rigid radicalism smuggles itself into radical spaces, and how it is being undone. Interviewees include Silvia Federici, adrienne maree brown, Marina Sitrin, Gustavo Esteva, Leanne Betasamosake Simpson, Walidah Imarisha, Margaret Killjoy, Glen Coulthard, Richard Day, and more.