Well I’m not a communist so I’m kinda the wrong guy to ask but you’d be surprised, Lenin is on that list for me. You know the guy who warned everyone that Stalin must under no circumstance be allowed to lead. A lot of good analysis, alas his solutions often had first solution syndrome, meaning they were insufficiently hardened against good ole power dynamics taking over because, as Marx so rightly observed, it’s in a class’ interest to act in its own self-interest and ultimately the nomenklatura is a class as distinct from the proletariat, or even party base, as priests are from believers. I’m pretty sure if the guy had Lenin’s failures to look back at he’d do a lot better, though.
If you want something random to read to learn from I’d recommend the Anarchist Library. And Bookchin in particular.