Соловецкий лагерь особого назначения
The Solovki special camp (later the Solovki special prison), was set up in 1923 on the Solovetsky Islands in the White Sea as a remote and inaccessible place of detention, primarily intended for socialist opponents of Soviet Russia's new Bolshevik regime. The first book on Gulag, namely, "In the Claws of the GPU" (1934) by Francišak Aljachnovič, described the Solovki prison camp.