For fifteen years the writer Varlam Shalamov was imprisoned in the Gulag for participating in “counter-revolutionary Trotskyist activities.” He endured six of those years enslaved in the gold mines of Kolyma, one of the coldest and most hostile places on earth. While he was awaiting sentencing, one of his short stories was published in a journal called Literary Contemporary. He was released in 1951, and from 1954 to 1973 he worked on Kolyma Stories, a masterpiece of Soviet dissident writing that has been newly translated into English and published by New York Review Books Classics this week. Shalamov claimed not to have learned anything in Kolyma, except how to wheel a loaded barrow. But one of his fragmentary writings, dated 1961, tells us more.