I read Homage to Catalonia a few years ago and thoroughly enjoyed it, however I've been wondering ever since whether Orwell is biased in how he reports it (I recall he himself wrote he thought to be).
More specifically, I'm interested in the dynamics between the parties involved, and how Orwell claims the URSS ended up fighting against both anarchists and minority communists.
Here is an interesting answer.
/u/Georgy_K_Zhukov also covered a similar topic in this week’s short answers. His answer emphasizes that Orwell’s experiences were in some ways not topical and, also, of course Orwell was writing as a participant and witness rather than, say, historian.