One of the suspects in the beating of a young African-American man during the Unite the Right rally in Charlottesville, Va., was arrested in Georgia on Monday.

Alex Michael Ramos, 33, was charged with malicious wounding in the Aug. 12 attack on DeAndre Harris, 20, a teacher’s aide and aspiring rapper, who was beaten by a group of people with wooden boards and pipes.

Mr. Ramos was being held Tuesday in Forsyth, Ga., about an hour south of Atlanta.

The attack was captured on video, and the images were shared widely on social media and used to highlight the mayhem that broke out at the white-power rally when the police did not step in to keep order. The video images helped the authorities identify at least two of the suspected assailants, Mr. Ramos and another man, Daniel P. Borden, who was arrested in Ohio on Friday. At least four more of the assailants have yet to be identified.

The case has become a focal point of debate on social media. Right-wing activists blame Mr. Harris for his injuries and have posted his home address and telephone number online. Mr. Harris, who sustained a broken wrist and a head wound that required 10 staples, cannot return to work because seeing large groups of people make him anxious, his lawyer, S. Lee Merritt, said.