Kolyma
Kolyma was the most notorious labour camp. It was located at the extreme northeast of Siberia and had a reputation to be the coldest inhabited place on the planet. Kolyma was mined for its rich deposits of gold by the laborers in the Gulag camps though millions of prisoners perished in the camps due to the cold Arctic climates. Stalin used this as free labour to obtain essential resources and a way to get rid of the criminals and communist resistance by sending prisoners to Kolyma.
Read more about this topic: Forced Labor In The Soviet Union