I'm writing a currently genre ambiguous Sci-Fi/lovecraft/spaceopera/superhero novel that doesn't outright declare everyone is openly is Maoist/Anarchist/Stalinist/Etc., (the alien characters won't have human etymology for their ideologies) and maybe it's not actually all that political on the surface anyways, but any tips for slipping in vegan and leftist dog-whistles?
maybe call out billionaires and anti-semites
yes, but the point is you have to call out billionaires directly and make clear what is wrong about them. This isn't subtle or sneaky.
I just think it could maybe work to have some villains who blame the billionaires shit on a racial group to go with sly anti-billlionaire stuff
Again, not subtle. You need to name specific groups to make clear what you are saying, not innuendo.
again I think if you tie it in with themes it could work