'Lawyers' mail used to get drugs into jail

Two convicted murderers are among more than a dozen people accused of running bikie gang drug rings inside two Queensland prisons.

Nineteen people, including seven inmates, face 51 charges following a three-month police and corrective services probe into separate Mongols and Bandidos bikie drug rings.

It's alleged gang associates who are inmates at the Arthur Gorrie and Maryborough Correctional Centres were coordinating drug trafficking networks within and outside the centres.

Taskforce Maxima police superintendent Mick Niland says those involved stashed the drugs inside fake letters from lawyers.

"On several occasions there were interventions over the three months, trying to prevent those getting inside but of course some did make it inside," he told reporters on Thursday.

"It shows how serious, violent, and ruthless these crime gangs are."

Five ounces of ice, more than 100 strips of the painkiller buprenorphine and an undisclosed amount of cannabis were intercepted by police.

The drugs are worth about four times their street value inside prison.

Superintendent Niland wouldn't disclose the other ways in which inmates attempted to smuggle drugs into the prisons.

Five of the inmates charged, including two convicted murderers, face drug trafficking offences.

Five others arrested in southeast Queensland face drug trafficking charges, while others face a range of offences.

Nine search warrants were executed on the Gold Coast, Brisbane, Bundaberg, Biloela, Poona and at the Maryborough Correctional Centre on Wednesday and Thursday.

Detectives also seized $21,000 in cash, methamphetamine, or ice, cannabis and buprenorphine during raids outside the prisons.

It's also alleged one of those arrested, a 25-year-old alleged Mongol associate who is an inmate at Arthur Gorrie Correctional Centre, tried to buy 10 guns worth $3000 which he planned to resell outside of prison.

More arrests are likely.

There is no suggestion members of Queensland Corrections have been party to or helped facilitate the actions of the drug trafficking networks.