Many protesters waved Confederate flags and chanted fascist and nationalist slogans.
Fields, who recently moved to the OH area from Kentucky, can be seen in the dashcam footage driving the same Dodge Challenger that ripped through groups of those opposing white supremacists in the Virginia city for the planned "Unite the Right" rally.
Fields last lived in Maumee, Ohio, records show.
The authorities, however, declined to say publicly that Fields, 20, was the driver. The attack killed 32-year-old Heather Heyer and left 19 others injured.
Fields was arrested shortly after and has been in custody ever since.
Several hundred protesters were marching when the vehicle appeared to deliberately drive into a group of them, The Associated Press reported. Fields was also seen holding a shield emblazoned with Vanguard America insignia. "All our members had been safely evacuated by the time of the incident. The shirts were freely handed out to anyone in attendance".
The violence saw widespread condemnation by politicians, many of whom directed ire towards the hateful ideologies espoused by numerous far-right marchers. He said he met with the FBI director and U.S. Attorney General, and the Department of Justice has opened a civil rights investigation.
As they waved Confederate flags and screamed racist, homophobic and anti-Semitic slurs, the protesters - nearly all white and male - were met with fierce resistance from activists who had come to stop them.
After a few speakers took the stage, people took to the street - marching and chanting against racism, against hate and against President Donald Trump - despite President Trump speaking out against the attack.