"If we were to make an apology, that would suggest that we have done something wrong," the company said.
Ellison's "antifa" tweet appeared to be a troll of President Trump.
Antifascist activists worry that the Trump administration is trying to crack down on dissent.
White supremacist leader Jason Kessler has applied to hold a 2018 Unite the Right rally in Charlottesville.
Refuse Fascism wants millions of people to take to the streets, demanding that the Trump administration step down from power.
Protesters chanted “Nazi punks f—k off!" after an alt-right rally in Tennessee folded today.
This latest conspiracy theory is being pushed, again, by the likes of Alex Jones and Yournewswire.com.
"These men are deeply, deeply misogynistic," activist Yvette Felarca says about alt-right protesters. "I ask them: Do you have a problem with your mother?"
A report from the Department of Homeland Security outlined how anarchist groups and extreme-right supporters were preparing for an unprecedented confrontation.
Many of President Donald Trump's supporters were unhappy with his latest statement on the violence in Charlottesville.