The U.S. Justice Department gave its approval Friday to a Georgia law requiring voters to show a photo ID at the polls.

Supporters — including Republican Gov. Sonny Perdue, who signed the measure earlier this year — say it is needed to crack down on voter fraud. Opponents say it unfairly discriminates against minorities, the poor and the elderly, who are less likely to have a driver's license.

Under the law, voters who do not have a license can get a state-issued photo ID for free.

The law makes Georgia one of seven states to require photo identification at the polls.

Under federal law, changes in election procedures in the South and other parts of the country with a history of discrimination require Justice Department approval.

The Justice Department decision came in a letter from John Tanner, chief of the voting rights section.