A white supremacist involved in the Charlottesville attacks that left three people dead over the weekend has called the murders "justified" and gloated that the extremist march will be "really tough to top".

"The fact that nobody on our side died, I'd go ahead and call that points for us," white nationalist Chris Cantwell grins at the end of Charlottesville: Race and Terror, a Vice documentary on the violent clashes in Virginia on Sunday.

The documentary, which airs on SBS Viceland on Thursday evening, sees reporter Elle Reeve trailing a group of white nationalists and neo-Nazis ahead of Sunday's Unite the Right rally.

The rally, which saw white supremacists protesting the planned removal of a statue of Confederate general Robert E. Lee, turned violent amid resistance from local residents and counter-protestors Antifa.