As someone who has recently started to read Homage To Catalonia, from a historical perspective was Orwell's testimony of the POUM accurate or just rose tinted glasses? Was it democratic and could its economy/political system subsist without the war economy? How did Hitler react to the POUM having trotskyists embedded within it? Can Rojava and the Zapatistas be used as a modern analogue?
You may be interested in this older answer of mine, which gives an overview of the Spanish Revolution in practice, and an assessment of Orwell's commentary on political conflict in Republican Spain. I'm afraid it doesn't cover Hitler's opinion, though I doubt whether he particularly cared or knew much about the POUM itself.