SYDNEY -- About 500 people gathered at Martin Place in Sydney on Tuesday to urge the New South Wales government to act on alcohol-fueled violence, local media reported.

Anti-violence group Enough is Enough called for the rally after Kieran Loveridge was given a minimum four-year jail term for the death of 18-year-old Thomas Kelly in a king-hit attack at Sydney's Kings Cross in July 2012.

New South Wales Attorney-General Greg Smith said he had asked the Director of Public Prosecutions to review the sentence and consider if there were grounds for an appeal.

Enough is Enough founder Ken Marslew expressed community concerns about sentencing for one-punch manslaughters.

"Young Thomas got the death sentence, the family have got a life sentence, the killer got four years," he said.

Police Association President Scott Weber supported tougher measures to stop alcohol-related assaults.

The New South Wales government has confirmed it will introduce so-called "one-punch" law in 2014 to deal with situations where an unlawful assault causes death.