The Unite the Right activists have complained that their Free Speech had been violated by Antifa. From their event page:

“Roving mobs of Antifa have cracked down on the First Amendment rights of conservatives and right wing activists.”

https://us.eventbu.com/charlottesville/unite-right-free-speech-rally/3855389

Turns out, that’s not possible:

With the notable exception of the Thirteenth Amendment’s ban on slavery, the individual liberties guaranteed by the United States Constitution protect against actions by government officials but not against actions by private persons or entities. Because of this, civil-rights lawsuits seeking to vindicate federal constitutional rights are limited to those situations where there is “state action,” the term used to describe the action of government officials exercising their governmental power. https://www.nyclu.org/en/publications/column-applying-constitution-private-actors-new-york-law-journal