I relatively new to learning about the mob and I was wondering about the size and power of each individual crew in a family.

From my understanding most crews range between 8-15, but mostly consist of only 10 guys. These are supposed to be the guys who run their neighborhood so to speak, but usually you have street gangs that have 20+ members so how do they overpower them?

I thought the answer to this question would be that they have associates, but what I have read is that most associates don't directly work for a soldier and carry out orders but are just guys that they work alongside and form partnerships with. It just seems strange that only 10 guys can control the crime in one area when so few in number.