His expression was mild, but Harry felt sure Lupin, at least, knew that some Extendable Ears had survived Mrs Weasley’s purge.
They had arrived outside a large, old-fashioned, red-brick department store called Purge 6z Dowse Ltd.
Harry glanced around at the jostling crowd; not one of them seemed to have a glance to spare for window displays as ugly as those of Purge & Dowse Ltd; nor did any of them seem to have noticed that six people had just melted into thin air in front of them.
In a far corner glinted small objects and coins that Harry guessed Kreacher had saved, magpielike, from Sirius’s purge of the house, and he had also managed to retrieve the silver-framed family photographs that Sirius had thrown away over the summer.
There are no more uses of "purge" in the book.
Show samples from other sources
The extremists in the party want to purge the leadership of moderates.
Unlike most of his colleagues, he survived the purge of intellectuals during the Chinese Cultural Revolution.