Fields was photographed marching in the rally with a shield showing the Vanguard America logo hours before police said he rammed into the crowd.
Fields is being charged with one count of second-degree murder, three counts of malicious wounding and one count related to leaving the scene of a wreck. Fields is scheduled for an arraignment on Monday.
Since Fields was named as the suspect, local media have identified him in images showing the OH resident attending the far-right rally and holding a shield emblazoned with the insignia of the "Vanguard America" hate group.
He travelled to Virginia to take part in a march organized by white nationalist groups, many of whom claim to be supporters of U.S. President Donald Trump, to defend a statue of a Confederate civil-war hero set for removal.
Fields's views were known to Derek Weimer, his former teacher at Randall K. Cooper High School in Kentucky, where he said other teachers were also concerned about the quiet student's "very radical beliefs".
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Authorities said they were surprised to learn of the 20-year-old's role in the deadly crash Saturday based on their brief interaction with him, according to the news station.
"I try to stay out of his political views", she said.
Ms Samantha Bloom, Fields' mother, told the Toledo Blade newspaper that her son said last week that he was planning to attend the "alt-right" rally in Virginia, but she insisted she was unaware of its extremist nature.
Bro continued: "I always encouraged her to be strong and strong-minded - even though that wasn't always easy to raise - but I was always proud of what she was doing".
As Bloom was told about the allegations against her son, she told reporters that Fields' has a black friend.
"I was born and raised in this town", Jeffrey Albright said. Far-right activists flocked to Charlottesville for the rally while hundreds of anti-fascists turned up in a counter protest. "When such actions arise from racial bigotry and hatred, they betray our core values and can not be tolerated", said Attorney General Jess Sessions.