An indigenous tribe also serves as a model for anarchism inasmuch as the tribe makes decisions through direct democracy on a small scale, i.e., the scale of a Dunbar number of not more than 150 persons. This presumably is the amount of people that one can get to know intimately.
There are, however, features of primitive tribes which are inimical to free thought. And it is in this respect which Karl Popper condemns “tribalism” as a closed society. Primitive tribes are closed to metaphysical and ritualistic disagreements. This unsavory aspect is continued in modern societies by religions and patriotic rituals.
If the essence of socialism is the right to subsistence, then socialism is carried out by the States in the form of prisons, and in the case of the United States in the form of Indian reservations, and to a lesser extent by welfare programs. Let us call these Prison Socialism, Reservation Socialism, and Welfare Socialism. There are also various non-governmental charitable organizations serving, for example, the homeless. Call these Charitable Socialisms.
Talking about Prison Socialism, have you seen Michael Moore’s video “Where to Invade Next“? Watch the whole film about how socialism works, and especially the clip from the film about Norwegian prisons: