Kings Cross strip clubs Bada Bing and DreamGirls have been slapped with long-term closure orders over a raft of licence breaches, including staff allegedly selling cocaine to patrons.

Police raided the notorious clubs last December and they were temporarily closed after an investigation into drug supply within the venues.

The New South Wales Independent Liquor and Gaming Authority has now approved the Office of Liquor, Gaming and Racing's application to shut the venues down for the long term.

The application against DreamGirls alleged that undercover officers were sold cocaine by venue staff, strippers were openly snorting the drug and there was an illegal bar operating inside the club where alcohol was sold and drug use and smoking allowed.

During the raid in December, police allegedly found 17 plastic bags containing suspected drugs.

DreamGirls owner Frank "Ashtray" Amante said at the time that the raid was a "bit of an overkill" and when asked about drug dealing by staff said: "That could be happening there. I don't know. I'm not there that much."

The order forces DreamGirls to close for six months from February 1 or until "persons acceptable" are appointed as licensee or manager, a venue drug control policy is created and security cameras are installed to monitor access to levels of the club.

The application against Bada Bing said that undercover officers were able to purchase cocaine at the club on multiple occasions in 2015, including from a responsible service of alcohol marshal.

The club is also accused of allowing members of outlaw motorcycle gangs to enter the venue, in breach of the Kings Cross laws, and of breaking licence conditions intended to protect strippers from being assaulted by patrons.

As with DreamGirls, Bada Bing has been forced to close for six months, from January 31,or until new "acceptable" appointments are made. Long-term conditions on the club include that no staff with liquor or drug convictions can be hired, that extra surveillance cameras must be installed within the club and a long-term venue drug policy formed.

In January, Fairfax revealed that a previous application from the The Office of Liquor, Gaming and Racing to cancel DreamGirl's liquor licence was rejected six months before police carried out the drugs raids in December.

The application came after a 16-year-old was served alcohol at DreamGirls, having not being asked for identification for scanning at the entrance.

Mr Amante was in January attempting to sell the business amid the moves for a long term closure order.