Urchins are your go-to for turning Businesses into profit machines. They infiltrate Businesses, skimming off resources for your gain. However, they can be evicted from Businesses by Gangs and Truant Officers, in which case they are lost to the streets again.
The cost of urchins can be reduced by orphanages. With a fully upgraded orphanage, urchins will gain the ability to evict enemies, where one friendly urchin can evict one enemy urchin, and both are lost to the streets.