The classic ones are Kaiserreich and The New Order: Last Days of Europe, they still do a bit of horseshoe theory but most portrayals of socialists are accurate excluding the comically evil ones

Kaiserreich is the usual suspect, but surprisingly The Fire Rises is also pretty good. It's not positive (and depends on the country given the different teams). I reccomend the china paths (although it references "xinjiang" methods or whatever, but it doesn't reference that stuff too much). There's also red world, which allows you to shoot Gorbachev and making fully automated cybernetic production communism in the USSR.