Iron curtains exist to realize the totalitarian dichotomy, not to protect secrets.

Evidence

The totalitarian conspiracy against the nontotalitarian world, on the other hand, its claim to world domination, remains as open and unguarded under conditions of totalitarian rule as in the totalitarian movements. It is practically impressed upon the co-ordinated population of “sympathizers” in the form of a supposed conspiracy of the whole world against their own country. The totalitarian dichotomy is propagated by making it a duty for every national abroad to report home as though he were a secret agent, and by treating every foreigner as a spy for his home government. It is for the practical realization of this dichotomy rather than because of specific secrets, military and other, that iron curtains separate the inhabitants of a totalitarian country from the rest of the world. Their real secret, the concentration camps, those laboratories in the experiment of total domination, is shielded by the totalitarian regimes from the eyes of their own people as well as from all others. — Hannah Arendt, The Origins of Totalitarianism, 975

Categorization

• XREF: Connects directly to necropolitics and manufactured threat narratives that later Islamophobia readings assume — the state’s power to define enemies and seal populations against them.