The Wizengamot was rounded up and stripped of all their powers right after lockdown of the Ministry. Employees were re-interviewed and slowly they only re-hired the ones that were completely cleared for any linkages with the old Wizengamot and on honest merit of their jobs. The Wizengamot was temporarily composed of the heads of each of the eldest known Wizarding families from the followers of Hermione and Draco. Their job was to re-establish the Wizengamot to its prior glory.