The Atlanta Humane Society looks like a great network that puts on exciting fundraisers and events to help the animals. It reminds me a lot of where I volunteer-Animal Haven here in New York, except much bigger and with a lot more resources.
Also, the Atlanta Bully Rescue is an amazing shelter that saves bully breeds specifically - even if they are abused and need intensive mendical care and treatment. ABR is no-kill, with the exception of human-agressive dogs, un-rehabilitatable dogs, and dogs suffering from illness. All the dogs get "house-time" so that they can begin their path to being real house dogs right away. Like me, the fantastic founders of ABR dream of purchasing a farm for their shelter with ample room for the dogs. Because space at ABR opens only when a dog is adopted, they are in need of fosters-If you are in the Atlanta area and can help, please click here: ABR
Here is an important note about Pit Bull Overpopulation from ABR founder, Whitney Horne: