Nancy Mace actually said...

So this picture of the Dakota Access protesters, they set fires, they lobbed Molotov cocktails, they fired shots to face off with police, an...

Is it just the right trying to silence the speech of the left, or does the left also try to silence the speech of the right?

That to me is a violation of First Amendment, at least as it is being reported.

Is this considered protected free speech, yes or no?