[austin-cheney]

That’s complicated. The US has criminal and civil law. With regards to criminal law in terms of expression and liberties there are very few things you cannot do. The default is to lean towards liberty always.

In terms of civil law you can generally sue anyone for anything at anytime unless there is existing law or contracts halting further civil actions.

[emodendroket]

You can't sue someone for calling for violence, including racially motivated violence. Incitement is a crime, but incitement happens when you direct someone to take a specific action and they do exactly what you said (e.g., you tell them to go beat someone and they do it).