Police say yesterday's sweeping raids across New South Wales netted at least four underworld kingpins and wiped out three major crime networks supplying guns and drugs to bikie gangs.

The raids started at dawn and continued well into the night at 30 properties linked to senior bikies and organised crime figures in Sydney, the Illawarra and the Upper Hunter region.

Fifteen people have been charged, mostly with supplying guns and drugs. Charges are expected to be laid against another four.

Nine faced court yesterday, including two Hells Angels chiefs and an alleged Wollongong underworld kingpin who were charged with supplying drugs.

The chief of the Hells Angels' Sydney chapter, Felix Lyle, and the alleged president of the gang's "Westside" Parramatta chapter, Kemel "Blackie" Barakat, were refused bail in Sydney.

Lyle is also accused of trying to sell 50 Glock pistols that had been smuggled into Australia.

The alleged boss of a Balkan drug network, George Bubanja, was granted bail in a Wollongong court but failed to raise a hefty surety to be released.

The 48-year-old is trying to find hundreds of thousands of dollars today.

A police source says the operation has dismantled Bubanja's alleged network, as well as two major gun supply syndicates with tentacles in Asia.

Among five people facing court today will be another alleged Balkan crime figure, Goran Mackic, who is accused of selling four sticks of explosives to fuel a brewing bikie war.

The alleged Sydney boss of one of the Asian gun supply syndicates, Vin Ouy, will also face court after being arrested at his Abbotsbury home while allegedly carrying a pistol and cash.

The ABC understands the NSW Crime Commission has seized the 39-year-old's assets, including $150,000 of premium Penfolds Grange wine.

Ouy has been charged with possessing a gun and drugs.

The police raids also targeted senior members of the Rebels and Comanchero bikie gangs.

The operation followed a covert and high-risk 21-month investigation by police and the NSW Crime Commission into the supply of guns, drugs and explosives between organised crime groups and bikie gangs.

Police are still dismantling two clandestine drug laboratories uncovered during the raids. Officers also seized guns, two kilograms of drugs and more than $350,000 in cash.

Detectives are planning to charge up to 11 more people who are in custody. They say more arrests are likely over the coming days and weeks.