Ive posted this before.
Its a chicago tribune article about relations between the outfit and street gangs. Its from 1974, It involves sit-downs between the p stones, mickey cogwell and joe divarco and big joe arnold on the outfit side. It was concerning coming to a financial arrangement with the gang in order to stop them from terrorising the mob operations in black neighbourhoods.

http://archives.chicagotribune.com/1974/04/21/page/217/

" what it stopping some of the Chicago street gangs today from simply deciding to start competing with the Outfit in various rackets?"

What rackets can we actually confirm the modern day outfit have some monopoly over in chicago that would warrant another group to come in and compete with them for it.