This article explores how “the left” meme and the character and emotional reception of taboo-breaking therein via the case of r/DankLeft—a USA-centric Marxist, Anarchist, and Democratic Socialist Internet meme community. It asks: what themes do popular r/DankLeft Internet memes relate to, how does taboo feature within popular r/DankLeft Internet memes, and can any differences in the ways in which taboo-related r/DankLeft Internet memes are received be discerned. In turn, it carries out a thematic analysis of 366 popular memes, a multimodal critical discourse analysis of 41 taboo-related popular memes, and a comparative sentiment analysis of the comments these and other memes have received in r/DankLeft. The article finds that popular memes in r/DankLeft primarily relate to perceived threats to its community of users. It also shows that taboo-breaking does feature in r/DankLeft memes and that when it does correlative patterns emerge in terms of popularity and emotional reception.