MVD special camps of the Gulag was a system of special labor camps established addressing the February 21, 1948 decree 416—159сс of the USSR Council of Ministers of February 28 decree 00219 of the Soviet Ministry of Internal Affairs exclusively for a "special contingent" of political prisoners, convicted according to the more severe sub-articles of Article 58 : treason, espionage, terrorism, etc., for various real political opponents, such as Trotskyists, "nationalists", white émigrés, as well as for fabricated ones. Wikipedia