Excerpt from below linked article:
Georgia discovered it had to go to court to obtain approval of a law that ensures only citizens are registered to vote. The Justice Department was objecting to the law.
Holder's DOJ backed off on fighting that when Georgia threatened to sue.
When I moved to NC from GA. I had to mail a copy of my NC drivers license to the GA board of elections to get my name removed from the GA voter rolls. I was concerned that someone would vote in my name. I’m not 100% sure about registering but I think you do have to prove who you are.