A former Hawaii prison gang leader testified in federal court Thursday against a former guard and an inmate, accusing them of being involved in drug smuggling and racketeering in a federal case.

Tafiaiga Ioane testified he was a member of the "USO Family" for 15 or 16 years and was a captain, or "shot caller," which is the gang’s highest rank. Ioane is currently in protective custody at the Federal Detention Center.

Ioane’s testimony came on the second day of trial for Feso Malufau and Tineimalo Adkins. Malufau, a former Halawa Correctional Facility guard, is charged with racketeering conspiracy, accused of taking bribes to smuggle drugs into the prison. Adkins is charged with violent crimes in aid of racketeering, accused of leading a gang assault on a fellow Halawa inmate.

They are the last of 18 people indicted last September who haven’t already pleaded guilty. Their indictment describes a racketeering enterprise by the USOFamily that included drug smuggling, bribery, violence and tax fraud.

Ioane said that when he arrived at Halawa from a prison in Arizona in 2010, Malufau approached him, said he knew about him, and offered to help Ioane with anything he needed. Ioane said he believed "anything" to mean contraband.

Details of the conviction that sent him into the state prison system were not available.

During that first week that he was at Halawa, Ioane saw another inmate, whom he knew as "Esera," talk to Malufau in his office and come out with a trash can containing crystal methamphetamine hidden in three cartons of cigarettes.

Charlie Esera is Malufau’s co-defendant. He pleaded guilty in July to bribing Malufau and smuggling drugs into Halawa and will be sentenced in November.

Ioane said Esera, who ran the gang’s operations at Halawa, explained to him how things worked at the prison, which included smuggling in meth, marijuana, cigarettes and the synthetic drug Spice. He said it cost $1,000 to bribe guards to bring in 3.5 grams of crystal meth and $100 for a pack of cigarettes in 2010.

Ioane also testified against Adkins, claiming Adkins told him he ordered the attack on another inmate who owed the gang drug money in 2013.

Ioane said he was in solitary confinement at Halawa when Adkins and other USO members were brought in because of the attack. Ioane said he talked to Adkins about the attack through a vent while standing on a sink.

Defense attorneys questioned Ioane’s credibility, however, suggesting that he was testifying to get an early parole hearing.

Attorney Barry Edwards, representing Malufau, said Ioane had met with investigators several times since 2010 or 2011, but never mentioned Malufau until August. He said Ioane also mentioned another guard, but not Malufau, during a grand jury hearing in 2013.

Adkins’ attorney, Marcus Sierra, also said Ioane had never been prosecuted for his crimes mentioned during his testimony, such as starting a fire during a riot, breaking another prisoner’s jaw as an initiation to get into the gang, and smuggling drugs.

Ioane said he was cooperating to turn his life around.

"I want to be a good father to my son," he said. "I made some bad choices."

Also Thursday, Deputy U.S. Marshal Anton Hopkins testified that he found Adkins showing a document sealed to the public to another inmate in a holding cell at the courthouse.

Hopkins said the document was a government witness list from Adkins’ case files and included Ioane’s name. He said the inmate looking at the document is housed in the same module as Ioane.