Just finished The Traitor Baru Cormorant and it's really fucking good. (I wanted to say that I enjoyed it but that might be the wrong word). It's not a specifically leftist book (it's set in a feudal society) but it talks about race/gender/sexuality/colonialism in a way that extremely rare in fantasy novels. It also understands that you can have a book be dark without just throwing rape and murder and suffering at your female characters, which might be even rarer.

Also currently reading The Wretched of the Earth, which I really should have read before now.