Max Stirner's idea of the "Union of egoists" (German: Verein von Egoisten), was first expounded in The Ego and Its Own. The Union is understood as a non-systematic association, which Stirner proposed in contradistinction to the state. The Union is understood as a relation between egoists which is continually renewed by all parties' support through an act of will. The Union requires that all parties participate out of a conscious egoism. If one party silently finds themselves to be suffering, but puts up and keeps the appearance, the union has degenerated into something else. This union is not seen as an authority above a person's own will. This idea has received interpretations for politics, economics, romance, and sexual relations.
In his main work, The Ego and Its Own, Stirner makes a difference between society and the union of egoists. As such "Morality is incompatible with egoism, because the former does not allow validity to me, but only to the Man in me. But, if the State is a society of men, not a union of egos each of whom has only himself before his eyes, then it cannot last without morality, and must insist on morality. Therefore we two, the State and I, are enemies. I, the egoist, have not at heart the welfare of this “human society,” I sacrifice nothing to it, I only utilize it; but to be able to utilize it completely I transform it rather into my property and my creature; i. e., I annihilate it, and form in its place the Union of Egoists."
Also he establishes other oppositions along the same lines "The Christian people has produced two societies whose duration will keep equal measure with the permanence of that people: these are the societies State and Church. Can they be called a union of egoists? Do we in them pursue an egoistic, personal, own interest, or do we pursue a popular (i.e. an interest of the Christian people), to wit, a State, and Church interest? Can I and may I be myself in them? May I think and act as I will, may I reveal myself, live myself out, busy myself? Must I not leave untouched the majesty of the State, the sanctity of the Church? Well, I may not do so as I will. But shall I find in any society such an unmeasured freedom of maying? Certainly no! Accordingly we might be content? Not a bit! It is a different thing whether I rebound from an ego or from a people, a generalization." "For the State is likewise a society, not a union; it is the broadened family (“Father of the Country — Mother of the Country — children of the country”)"(cursives are Stirner´s choice).