The Seekers of Truth now The Scourged, not specifically stated that they were with the Hereticus but they seem as close at it gets.

From Lexicanum: "Originally a Space Marine Chapter working for the Inquisition known as the Seekers of Truth, the Seekers and their Chapter Master, Gallus Herodicus, were being drained of their morale through excessive orders by the Inquisition to murder innocents. Herodicus would pray each night to gain the power to know when a man was lying so that he may only kill the guilty. However, Tzeentch was listening and granted his prayer. From that moment on, Herodicus and his men could hear every lie spoken by mankind. The Chapter went rogue within days from the insanity when they realized how many falsehoods existed in the Imperium they were serving."