

The Gulag Archipelago: An Experiment in Literary Investigation is a three-volume nonfiction series . . .<
https://en.wikipedia.org/wiki/The_Gulag_Archipelago?wprov=sfti1
The Gulag Archipelago (Russian: Arkhipelag GULag; literally, “The Gulag Archipelago”) is a three-volume nonfictional literary investigation. . .<






Assuming for the moment that all these criticisms are completely correct and valid, “Provides no new information” or “documentation is methodologically unacceptable” or “selective bias” or “took license” do not mean that a book should therefore be characterized as fictional.