What are your left wing manga/anime recommendations? I only got Ninpu Kamui Gaiden, because it is communist and ninjaic? You may shrug you shoulders, but a communist created all the ninja cliches, like a dude named Sasuke and the "Izuna Drop"! Unfortunately, the manga is from 1969, when the United States still had not erased all left-wing presence in Japan.
There was a famous leftist manga creator who's main Marxist works have never been translated into English https://hexbear.net/comment/3317686
Kamui Den, the first series published in Garo, can be considered his most important manga work. It is the story of Kamui, a ninja who leaves an organization that pursues him and clearly sees the true nature of the Edo period and the discrimination that existed in the feudal system. Shirato's works are primarily historical dramas that focus on ninja, present a historical record of Japan, and criticize oppression, discrimination, and exploitation.