They publish the Squatter's Handbook, which is a guide to the law for squatters who want to evade eviction. They represent squatters in court free of charge and enable them to stretch out their squatting for months or years.
The Handbook is distributed for free by town council administrations throughout the UK and both ASS and the town councils are funded by property owners' taxes.
There are Handbook users in the UK who use the legal services and have not paid a cent in rent or legal fees for decades - even in the nicest neighborhoods in the UK there are squatters who opportunely moved into a deceased person's fancy address while the legitimate heirs waited for probate.
I’d block them in and burn it down around their ears, before I’d let them stay.