The Gulag Archipelago by Aleksandr Solzhenitsyn, narrated by Frederick Davidson.
This three Volumes book in which he details the horrors of the Soviet forced labour camps known as "Gulags", was originally published in 1973.
Alexander Solzhenitsyn - The gulag archipelago - PDF
Anne Applebaum - Gulag A history - Audiobook
Anne Applebaum - Gulag A history - PDF
Anne Applebaum - Red famine Stalin's war on Ukraine - PDF
Secret History - The Gulag Archipelago
William Luther Pierce - Butchering of Ukraine
William Luther Pierce - The Genocide at Vinnitsa