Hierarchy is a fixed arrangement of social positions in which some hold structural power over others — the capacity to command, punish, allocate resources, or define meaning in ways those below cannot refuse without consequence. Anarchism identifies hierarchy as the root structure that produces domination across its varied forms: state over subject, employer over worker, colonizer over colonized, adult over child, human over nonhuman.

The anarchist claim is not that all differences in knowledge, ability, or experience are illegitimate. A person who knows how to build a boat knows more about boatbuilding than someone who does not. The claim is that this difference does not entitle the knowledgeable person to command the other. Hierarchy is the conversion of a situated difference into a fixed structural position — the claim that because one person knows more, or owns more, or arrived first, they are entitled to obedience. This conversion is what authority names and what coercion enforces.

Hierarchy tends to reproduce itself. Hierarchical organizations produce hierarchical outcomes, which are then used to justify the hierarchy that produced them. The employer extracts surplus from the worker, accumulates wealth, and points to that wealth as evidence of superior capacity. The colonial power destroys Indigenous governance, imposes dependency, and points to that dependency as evidence that Indigenous peoples cannot govern themselves. Bakunin identified this self-reinforcing quality as the reason hierarchical means cannot produce non-hierarchical ends — the insight that grounds prefigurative politics.

Hierarchy is distinct from structure. Horizontal organization has structure — roles, processes, agreements — but distributes power rather than concentrating it. Federation coordinates autonomous groups without subordinating them. The anarchist objection is not to organization but to the vertical arrangement of organization — the stacking of positions into a chain of command.