Gulag, (Russian: “Chief Administration of Corrective Labour Camps”), system ofSoviet labour camps and accompanying detention andtransit camps andprisons that from the 1920s to the mid-1950s housed thepolitical prisoners and criminals of theSoviet Union. At its height, the Gulag imprisoned millions of people. The name Gulag had been largely unknown in the West until the publication ofAleksandr Solzhenitsyn’sThe Gulag Archipelago, 1918–1956 (1973), whose title likens the labour camps scattered through the Soviet Union to an island chain.

A system offorced-labour camps was first inaugurated by a Soviet decree of April 15, 1919, and underwent a series of administrative and organizational changes in the 1920s, ending with the founding of the Gulag in 1930 under the control of thesecret police,OGPU (later, theNKVD and theKGB). The Gulag had a total inmate population of about 100,000 in the late 1920s, when it underwent an enormous expansion coinciding with the Soviet leaderJoseph Stalin’scollectivization of agriculture. By 1936 the Gulag held a total of 5,000,000 prisoners, a number that was probably equaled or exceeded every subsequent year until Stalin died in 1953. Besides rich or resistant peasants arrested during collectivization, persons sent to the Gulag includedpurgedCommunist Party members and military officers, German and otherAxis prisoners of war (duringWorld War II), members of ethnic groups suspected of disloyalty, Soviet soldiers and other citizens who had been taken prisoner or used as slave labourers by the Germans during the war, suspected saboteurs and traitors, dissidentintellectuals, ordinary criminals, and many utterly innocent people who were hapless victims of Stalin’s purges.

Inmates filled the Gulag in three major waves: in 1929–32, the years of thecollectivization of Soviet agriculture; in 1936–38, at the height ofStalin’s purges; and in the years immediately followingWorld War II. Solzhenitsyn claimed that between 1928 and 1953 “some forty to fifty million people served long sentences in the Archipelago.” Figures supposedlycompiled by the Gulag administration itself (and released by Soviet historians in 1989) show that a total of 10 million people were sent to the camps in the period from 1934 to 1947. The true figures remain unknown.

At its height the Gulag consisted of many hundreds of camps, with the average camp holding 2,000–10,000 prisoners. Most of these camps were “corrective labour colonies” in which prisoners felled timber, laboured on general construction projects (such as the building of canals and railroads), or worked in mines. Most prisoners laboured under the threat ofstarvation orexecution if they refused. It is estimated that the combination of very longworking hours, harsh climatic and other working conditions, inadequate food, and summary executions killed tens of thousands of prisoners each year. Western scholarly estimates of the total number of deaths in the Gulag in the period from 1918 to 1956 ranged from 1.2 to 1.7 million.

The Gulag started to shrink soon after Stalin’s death; hundreds of thousands of prisoners were amnestied from 1953 to 1957, by which time the camp system had returned to its proportions of the early 1920s. Indeed, the Gulag was officially disbanded; its activities were absorbed by various economic ministries, and the remaining camps were grouped in 1955 under a new body, GUITK (Glavnoye Upravleniye Ispravitelno-Trudovykh Kolony, or “Chief Administration of Corrective Labour Colonies”).