A white supremacist gang leader for Aryan Circle (AC) pleaded guilty for trafficking narcotics and assisting with murder, according to the Department of Justice (DOJ).

David Williams, 38, along with Leland Hamm, 43, pleaded guilty for the 2016 Louisiana murder of Clifton Hallmark, 51, on Tuesday and Wednesday, the DOJ reported. Gang member Richard Alan Smith, 47, also pleaded guilty for the murder of Hallmark on July 25.

Williams also pleaded guilty for narcotics trafficking and possession of weapons.

Hallmark was a fellow member of the AC and was shot by Jeremy Jordan after a fight broke out in 2016, The Associated Press reported.

Williams, Hamm and Smith along with four other alleged members assisted Jordan after the murder to prevent his trial and punishment, a court paper filed on March 15 said.

The AC is a prison-based gang, though membership has grown outside of state and federal prisons. The gang has spread to rural and suburban areas of Texas, Louisiana and Missouri in recent years. (RELATED: White Supremacist Prison Gang Charged With Murder Of Fellow Member)

Members and associates are not supposed to comply with law enforcement, according to a court document filed on Dec. 14, 2017. Gang members may also receive financial support for those incarcerated or charged due to carrying out gang-related activities.

Williams and Smith are scheduled to receive their sentences on Nov. 20 while Hamm will receive his on Dec. 13.

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