They could probably catch a few perverts if they checked the editing history of the article on Wikipedia! https://en.m.wikipedia.org/wiki/Operation_Cathedral

news.bbc.co.uk/2/hi/uk_news/1167879.stm

On 2 September 1998, police across the world picked up 107 men in connection with one of the world's biggest internet paedophile ring.

Police seized a total of 750,000 pictures along with a library of 1,800 computerised videos depicting children suffering sexual abuse.

Officers from Operation Cathedral raided the homes of 12 men in Britain; nine were charged. Seven of them were sentenced on Tuesday; another was jailed three years ago. A ninth man committed suicide.