In CAS give your Sim the Mafia Boss trait.
Recruit Associates into your mafia family.
Click on a recruit, select the Action menu, Add or remove to your mafia family.
Note: you must add members before needed menus to show up.
Once you have associates in your mafia family you can meet with them through a social event.
This event is non goaled.
If you don’t see anyone in the event, add a few more or make sure they’re close by.
