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or terrorism executed within defense lines by secret sympathizers with an external force.

History

Origin

Although the term is generally thought to have originated in the Spanish Civil War, there is at least one much earlier use of the term in another European theatre. In 1906, the Austrian military attache in Belgrade, Pomiankowski, described an element of Serbian nationalists as "fifth-column work of the Serbian Radicals...which systematically poisons the attitude of our South Slav

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