A ban on bikies wearing club insignia from entering pubs and clubs in Kings Cross will be extended to include the notorious Sydney gang Brothers 4 Life.

Legislation tabled in state parliament on Thursday reveals the government wants the power to refuse entry to anyone wearing Brothers 4 Life insignia in an attempt to keep them out of the area.

Members of 22 outlaw motorcycle clubs including the Hells Angels, Comancheros and the Nomads are already barred from licensed premises in Kings Cross if they wear "any clothing, jewellery or accessory" identifying them as such.

The ban extends to "any image, symbol, abbreviation, acronym or other form of writing that indicates membership of, or an association with, any of the organisations specified".

The bill adds "Brothers 4 Life" and "Outlaws" to the list.

Brothers 4 Life insignia features crossed AK47 machine guns. The gang was founded by murderer Bassam Hamzy, who is serving life in Goulburn Supermax.

Most recently two members of Brothers 4 Life were charged over the murder of Sydney standover man Joe Antoun in Strathfield on December 16.

The state government has also announced introduced new long term "banning orders" for Kings Cross which allow police to apply to have anyone convicted of a serious alcohol-related offence banished from the precinct for up to a year.

Police are planning to use the new powers to ban members of outlaw motorcycle gangs and other criminals from Kings Cross in conjuction with a new system of linked identity scanners which will be mandatory for all large pubs and clubs.