The Gulag was the government agency that aministered the penal labor camps of the Soviet Union. "Gulag" is the Russian acronym for The Chief Administration of Corrective Labor Camps and Colonies — Главное Управление Исправительно-Трудовых Лагерей и колоний, Glavnoye Upravleniye Ispravitel'no-Trudovykh Lagerey i koloniy — of the NKVD. Eventually, by metonymy, the usage of "Gulag" began generally denoting the entire penal labor system in the USSR, then any such penal system. In Russian, Gulag is pronounced: (Russian: ГУЛАГ, listen (help·info))