Historical version 2 of Tourist Guides (view current version)
Considered by most residents and students of the city to be a menace, especially when mounted on open-topped buses and equipped with microphones.
Apparently they operate as a bit of a cartel - new-comers to the tour-guide market are strong-armed back out again - anything from them going up to the tourists who've just been guided and picking holes in the guides rhetoric to calling the police saying they've seen someone without a license, etc. They even have their own guild!