|1.||(formerly) the central administrative department of the Soviet security service, established in 1930, responsible for maintaining prisons and forced labour camps|
|2.||(not capital) any system used to silence dissents|
|[C20: from Russian G(lavnoye) U(pravleniye Ispravitelno-Trudovykh) Lag(erei) Main Administration for Corrective Labour Camps]|
A system of prison camps inside the former Soviet Union used for political prisoners. Under Joseph Stalin, millions of prisoners in these camps died from starvation and maltreatment. This system was given worldwide attention in the writings of Aleksandr Solzhenitsyn. Gulag is an acronym in Russian of the name meaning Chief Administration of Corrective Labor Camps.