This is an archived article that was published on sltrib.com in 2014, and information in the article may be outdated. It is provided only for personal research purposes and may not be reprinted.

A federal grand jury has indicted eight more people in an organization that allegedly violated drug laws by illegally distributing oxycodone, an addictive pain killer.

The indictment unsealed Monday brings to 31 the number of people charged in the investigation.

Included in the latest indictment was a 31-year-old man now serving a federal prison term for a firearms conviction who allegedly organized the distribution ring in Utah.

Most of counts involved a conspiracy to distribute oxycodone and to commit money laundering from about May 2007 to June 2012.

Those charged with operating a criminal enterprise face a mandatory minimum sentence of 20 years in prison if convicted.

The case is being investigated by agents from the Drug Enforcement Administration and IRS as well as Salt Lake City police.