

The Gulag Archipelago (1973) is a monumental three-volume non-fiction work by Aleksandr Solzhenitsyn that serves as a definitive history and personal memoir of the Soviet forced labor camp system (the Gulag) from 1918 to 1956. Solzhenitsyn describes the work as an 'experiment in literary investigation,' blending his own experiences as a prisoner with the testimonies of 227 other survivors, historical documents, and legal records. The book is structured into seven parts, covering the entire 'sewage disposal' process of the Soviet state: from arrest and interrogation to transport, camp life, and eventual exile or death (Britannica, Wikipedia).
Solzhenitsyn argues that evil is not confined to a specific class or group but resides in every individual. His famous assertion is that the line between good and evil 'cuts through the heart of every human being' (Claremont Review of Books).
The book explores how abstract political ideologies can be used to justify mass violence and dehumanization. Solzhenitsyn posits that without ideology, the 'Bluecaps' (secret police) could not have committed such widespread crimes with a clear conscience (The Gospel Coalition).
A major thesis of the work is that the camp system was not a 'Stalinist deviation' but was fundamentally rooted in the decrees and philosophy of Vladimir Lenin immediately following the 1917 Revolution (Wikipedia).
Solzhenitsyn highlights that those with deep religious or moral convictions often survived the camps with their humanity more intact than those who clung to material hope or political loyalty (Quora, SuperSummary).