Atlas of GULAG is a comprehensive infographic intro to the history of the Soviet repressive machine.
It will help you clarify the most important questions: how and when the system was formed, why it became powerful, and how it came to decline.
Written by the scientists of the GULAG Museum in Moscow.
Available in the English translation, too.
Original title (Russian): Атлас ГУЛАГа
English title: Atlas of GULAG
First published in the Levinarium Telegram Channel (now closed and deleted)