Why do anarchist theorists emphasize the necessity of a "federation" of workers' syndicates?

Bakunin and Kropotkin (and, more recently, Chomsky) all frequently extolled the virtues of a "federal" network of unions or a "federation" of collectively-owned enterprises. Doesn't a federal system imply a certain degree of centralization and top-down control from a central body of delegates? Do any anarchists discuss or reject this idea of federation?Why do anarchist theorists emphasize the necessity of a "federation" of workers' syndicates?
The form of federation they advocate is one in which everyone has an equal say. Instead of a pyramid-shaped power structure (with a few at the top and most at the bottom), that would be a flat line (with everyone on the same level).Why do anarchist theorists emphasize the necessity of a "federation" of workers' syndicates?
Not an anarchist federation. In an anarchist federation, there is no hierarchy. There are no leaders. It is a horizontal form of organization.

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