What is "it"?

I had an errand to do today in the centre of Belfast and I came across a couple of "Jehovah's Witnesses" (I will never grant them that title without putting the quotes around it, because they are no such thing). A very interesting, and hopefully profitable conversation ensued.

Welcome to Room 101

The thought police are primed, ready to launch a dawn raid on anyone who dares to cause upset. They will respond immediately at the first sign of a tear in the eye of a sensitive soul, and bring the full force of political correctness upon the head of any who don't think the way they are supposed to.