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A coup consists of the infiltration of a small but critical segment of the state apparatus, which is then used to displace the government from its control of the remainder.

Edward Luttwak (1979). “Coup D'etat: A Practical Handbook”, p.27, Harvard University Press
A coup consists of the infiltration of a small but critical segment of the state apparatus, which is then used to displace the government from its control of the remainder.