There's a find line in law between speech and acts. This is usually where people get tagged. Things like not getting a parade permit or public burning (flag cases). Even there, much turns on the content of the statute (does it prohibit all parades without a permit or just unpopular parades?). Persona non-grata is always a thing and leads to selective treatment, but that's not specific to the civil rights era and also wasn't very common then.

I mean ... yes, GLR likely persona non grata in that case, though it's not reflective of the civil rights era generally, and the originating charge was property related.

In fact, though in the late 70s, National Socialist Party of America v. Village of Skokie tends to show the general doctrine at play throughout the era. RAV vs. St. Paul likely has the entire history having been decided even later.