Accidental Magic Reversal Squad
From Harry Potter Wiki
The Accidental Magic Reversal Squad was a team of Wizards and witches whose job it was to undo any spells that were accidentally performed by others. Obliviators were known to have been in this squad to stop Muggles reporting magical sightings. The Accidental Magic Reversal Squard deflated Harry Potter's Aunt Marge after Harry accidently inflated her.
