Black Badge Division (or 'BBD') is a special US Marshals division in Purgatory. The team currently includes Wynonna, Waverly, Doc, Nicole, and Jeremy. Their superiors were Agent Lucado and Richard Moody but since the dissolving of BBD in Season 2, they are no longer in that role. It was also revealed by Moody that they were never a government agency.
They work keep the town safe from revenants and demons.
Originally a top-secret branch of Marshals, which was founded in the 1900's by Theodore Roosevelt. It was created so to eradicate paranormal forces that were blossoming on North American soil. Edwin Earp, Wynonna and Willa's grandfather was tasked with handling things there.