Recently started and it’s incredibly insightful, even just for more in-depth historical context around movements of the time period. Also chuckled that the intro mentions a couple times social-democracy being the “left-wing of the bourgeoisie/fascism” 
“social democracy is objectively the moderate wing of fascism” is from a speech by Stalin. It’s not really an unusual idea in left wing thought (although not universal, obviously)
Guess I’ll have to actually read more theory and see where else I can spot it in the wild 😜