Aleksandr Solzhenitsyn, 1962. A single Gulag day — first Soviet novel to depict the camps.
From Wikipedia
One Day in the Life of Ivan Denisovich is a short novel by the Russian writer and Nobel laureate Aleksandr Solzhenitsyn, first published in November 1962 in the Soviet literary magazine Novy Mir. The story is set in a Soviet labor camp in the early 1950s and features the day of prisoner Ivan Denisovich Shukhov.