Seven men and three women marched briskly through upper and lower levels of Phillips Arena on Wednesday night and shouted "Hands up! Don't shoot!" for 10 approximately minutes.
The NBA game was not disrupted during the march.
A grand jury declined Monday to indict police officer Darren Wilson in the death of Michael Brown, a decision that enraged protesters who set fire to buildings and cars and looted businesses in the area of Missouri where the unarmed, black 18-year-old was fatally shot.
The protesters at the Hawks' game left the arena peacefully. They were part of a larger downtown presence of approximately 30 people outside on Marietta Street chanting, "No justice, no peace!"