The Corleone's work in three branches:
The first branch is Communication and consists of negotiators and hagglers that are in charge of maintaining healthy relationships with other mobs and the police as well as merchants.
The second branch is Finance and is the biggest branch of the three. In this section members grow/make drugs sell them and stimulate the group with small cuts from each of the growers. This branch is also responsible for purchasing or crafting of weapons to supply for the mob.
The final branch is Security/Force which is in charge of protection of the mafia and growers as well as men to raid and steal from others when needed.
Each of these branches is headed by a supervisor that controls his/her specific branch.
Above all there is the Don who meets with the three supervisors to discuss possible improvements and ammendments to the mafia. The Don rules everyone underhim including the supervisors and manages the entire group to ensure everything runs smoothly.