Kolyma Stories, by Varlam Shalamov
That is not blurb inflation. Note that the book is long (734 pp. of stories), and the reading is slow, mostly because the narratives lack redundant information, not because they are clumsy or awkwardly written. It also takes perhaps a few stories to get into the swing of things and figure out how the fictional yet not fictional universe works here. But the content is entirely gripping, and full of social science.
Haven’t read it, but maybe some day.