When heads raised, local activist Meymoona Freeman led a call and response chant for people the group felt were oppressed.
"I will support those of all religions and faiths," she said, which the crowd shouted back.
They chanted for the poor, the disabled, the homosexual, the homeless.
As voices carried, they stood only yards from a Confederate monument behind the historic courthouse. Ironically, the Charlottesville protest had originally been started by people upset with the removal of a Confederate memorial.
Freeman knew all this.
"I don't care if there's some monument (on the Decatur Square)," she shouted to the crowd. "We made this square different."
Attendees said they were appalled by what they saw happening in Charlottesville, where far-right protesters came to the University of Virginia campus carrying torches Friday night.
In Decatur, Helena Herring held a sign calling for an end to white supremacy.
As a white woman, she said she benefits from it, "and we have to stand up and fight it.”
Rahim Snow, a Muslim who moved to America from Pakistan some 40 years ago, said he and his family immigrated because of this country's stance on equality for all. He braved the crowd to show he still believed in that, even after men marched through the streets of Virginia with torches and violence erupted.
"It shouldn't be happening in this country," he said.
Marian Gordin, a 73-year-old Atlantan, said she showed up in her hometown of Jackson, Mississippi to welcome the Freedom Riders who travelled south for equality in 1964. She remembers violence and hatred back then.
"I thought we had made progress," she said, as she held a dripping white candle to symbolize that there was work still to be done.
For more on Atlanta's reaction to Charlottesville, read here.