They had enough pull, having been Joe Colombo’s kids, and had enough knockaround guys in their crew, that they were able to do their own thing. Especially that they mostly operated in the upstate area. They’re not alone either, there are other guys who have strayed off and do their own thing also. Maybe not as large a crew, but others have done it. CN is far from what it was in the 1930-60’s era
Colombo brothers problem was that they got a bit nutty, pulling off violent armed robberies and crimes that drew too much LE attention. Had they been more surreptitious, they might have lasted much longer