A thing you can do apart from blocking is talking about it and raising awareness.Thight balancing though with doing “outrage marketing” for or making a self fulfilling prophecy.
If you are engaged, you could document malicous behaviour from them, so they can’t work in the shadows and their real intends are widely known. Truth is: few people like Nazis
Making the basic rules like Active moderation against racism, sexism, homophobia and transphobia should be a no brauner. Pls add this rule
If i remember correctly, gog allows this