I'm a vegan and will be until I die or I can't do it anymore for whatever reason, but it's the other way around for me. I don't trust other vegans until they say they're leftist/communist cause they're more likely way too into woo shit, bougie liberals that like the marketing term or health benefits, or right wingers/libertarians that stumbled into a good point/like the health benefits.
I also don't think it takes being a communist necessarily to see suffering in animals and want to stop it in whatever way one can. It's just if either non-vegan communists or non-leftist vegans honestly and critically looked at their beliefs, it would be hard to escape the correct conclusion.