The Air Raid Patrol (ARP) Wardens were responsible for patrolling British cities, towns, and villages during
the Blitz. They were there to enforce the
Blackout and ensure that no lights were visible that could be used by enemy planes to help them target. If there were bombs falling then they were also resposible for helping organise the emergency response.
There is a less than complimentary portrayal of an Air Raid Warden in the character of Hodges in the BBC Comedy "Dad's Army".