Turbulent times are upon us. Already, blockades, demonstrations, riots, and clashes are occuring regularly. It’s past time to be organizing for the upheavals that are on the way. Relative to their small size, affinity groups can achieve a disproportionately powerful impact. In contrast to traditional top-down structures, they are free to adapt to any situation, they need not pass their decisions through a complicated process of ratification, and all the participants can act and react instantly without waiting for orders—yet with a clear idea of what to expect from one another. The mutual admiration and inspiration on which they are founded make them very difficult to demoralize. In stark contrast to capitalist, fascist, and socialist structures, they function without any need of hierarchy or coercion. Participating in an affinity group can be fulfilling and fun as well as effective. Most important of all, affinity groups are motivated by shared desire and loyalty, rather than profit, duty, or any other compensation or abstraction. Small wonder whole squads of riot police have been held at bay by affinity groups armed with only the tear gas canisters shot at them. This how to build an affinity group guide is adapted from an earlier version that appeared in our book ‘Recipes for Disaster: An Anarchist Cookbook.’ Now completely updated.