A large movement needs ways for people to take care of one another and make local decisions without waiting for the entire crowd. In the organizing sense, an affinity group is a small team whose members understand one another’s aims, boundaries, and commitments.
The direct-action tradition of affinity groups emphasizes preparation and mutual support before, during, and after an activity. The term is also used for workplace identity groups, but those may operate through quite different arrangements.
Small enough to know the commitments
Imagine volunteers supporting a large public demonstration through an information point. Their affinity group can agree who brings materials, who communicates with other groups, and when members need to leave. Because they have prepared together, every minor adjustment need not become a decision for the whole event.
Trust should not be confused with identical opinions or unlimited willingness. Stating boundaries beforehand makes it easier to act without assuming that everyone accepts the same risks or responsibilities. A group built only around the most assertive member’s preferences may be cohesive while being poorly understood by its own participants.
Autonomy also needs connection. Small groups can duplicate work or undermine one another if information does not travel between them. Liaison roles and shared agreements make local initiative compatible with a wider effort. The group’s scale supports mutual knowledge; coordination lets that knowledge contribute beyond the small circle.