Heretical organization that originated on Tranch during the Tranch Insurrection, but later spread to other worlds when elements of the Shroud Council slipped through the Inquisition's fingers and escaped to other worlds.

The Pale Throng thrives where there are many mutants. It's ultimate goal is ever for the mutants to rise up in rebellion against the Imperium. Most Throng activites don't get that far so they bide their time and engage in a variety of crime and terrorism. The Ordo Hereticus is always looking for Throng activity - mutants are bad, organized mutants are much worse.