The claim: South side of Atlanta - FEMA designated detention facility.
What it really is: The base houses many different supply and support units including the U.S. Army Criminal Investigation Laboratory and the 3rd MP Group (CID), both units of the United States Army Criminal Investigation Command, and employs 456 active duty Army personnel, 1,663 Army reservist, and 1,667 civilians.
The base itself houses many large buildings there that appear to be warehouses, some of which are right across the street from civilian houses. The base itself is surrounded by the city of Forest Park. It seems unlikely that a FEMA camp could be hidden here.