My question involves civil rights in the State of: Georgia

My brother has served 2 months of a current six month sentence in a Georiga county jail. He has no felony charges/convictions and is registered to vote in the State of Georgia (He registered prior Feb. 1, 2016).

He asked correctional officers and Sgt's several times leading up to the Georgia primary election, and was denied by officers.

Does he have actions he can take?