Bloody Stumps Samurai(1962)

Chidaruma Kenpou: Onorera ni Tsugu

With this book, Hirata set out to draw a passionate critique of discrimination against the Japanese outcaste community, known as the burakumin, around the character of Gennosuke, a young buraku whose mission to avenge and uplift his people through the sword goes horribly and gorily wrong. Though clearly intended as an anti-discrimination broadside, Bloody Stumps Samurai rubbed the Buraku Liberation League the wrong way, leading to copies being confiscated and burned and Hirata temporarily blacklisted.

(Source: Retrofit Comics)