Superheroes aren't really Socialist as a concept, to be honest. You've got the one, powerful figure, living by their own rules and code. They're doing whatever it takes to stop evil, and by evil we mean this particular reprehensible, malignant individual.
Essentially, it's that joke about how Bruce Wayne wouldn't need to be Batman if he just ploughed his wealth into systemic reforms of Gothem City writ large.
Sperheroes comics along their OTL lines ITTL would probably end up being a 'Right Counterculture' rather than mainstream.
But... rather than being set in the modern world, you could have superhero-esque comics that are set more in Sword and Sorcery/Pulp Sci-Fi (John Carter of Mars style) settings. Perhaps leaning in to 'Chivalric Romance' and Arthurian Tropes.
This probably would still make them something of a 'Right Counterculture' phenomenon. Not, however, in the same was as the modern day set ones, which would probably be inevitably... Call it 'combative' with the new ASU order.
The Fantasy/Sci-Fi setting types, by contrast, could instead be a way of exploring how you can be a 'Proper, Red-Blooded American' (particularly, Proper Red-Blooded American Man) whilst still reconciling with the New Order. Leaning on the Chivalric/Arthurian Tropes to explore new definitions of masculinity etc.
...I just had the weird thought of a subbranch of comic books out of all this: Native American 'Westerns'. I doubt that your traditional Westerns are going to be au fait (given that they're sort of inherently centered around the glorification of colonialism.) So we might well see a wave of Comics told from a Native American Perspective, about resisting the European Colonialists, both in the West and in the older days when the Europeans were still fighting for the East Coast.
That could well be a... Fraught field, ITTL. I would forsee a lot of Writers (etc.) Still fetishising the Native Americans. Butchering their cultures and traditions, basically projecting whatever they want/need for the narrative onto whichever Natives they picked or made up for the work in question.
And, well. Maybe some works through in some themes about 'old ways' and change being bad and feeling like a stranger in your own country... You know, real subtle points of trying to link the Colonist Founders and the ASU. (Colonising Americans and appropriating the Natives, name a more iconic duo.)
I'm not sure how Conservationist/Environmentally conscious the Left Wing sphere was at the time, now I think on it. A Right Opposition centered around Environmentalism could be interesting (and would certainly lead into the whole 'stealing the Native Americans to make your point.')
Also, Oh. Oh. I wonder how The Lord of the Rings ends up ITTL.