Anybody can move troops and fight, but it takes more than that to run a mob. You need good men and weapons for them, but you also need the best politicians, FBI agents, police and army officers that money can buy. Eye for an eye. Favor for a favor.
Crime pays and illegal businesses are the profitable ones.
Keep offering protection and upgrading your businesses into money makers. Who wants to run a news stand when you get change it into an illegal gambling operation and make some real money. If you have many gangsters against you it is better to ally with some of your enemies and wipe them out later. Watch out for raids, hit men and unhappy politicians. In Chicago crime pays only if you can handle it.