Press [Caps Lock], then type i love hanson at the Lieutenant screen to place $50,000 in the safe, if the current amount is less than that.
Extra money for all gangs
Press D + A + R + T at the Lieutenant's section of the gang organizer to give $3,000 to all gangs.
Quickly find enemy hideouts
Pause game play at the beginning of the week and look for cars parked at treatment blocks. There will only be a few and will save time. Mark down where you found the car parked at the treatment block and explore it the next week.
Defeating opposing gangs faster
To kill opposing gangs faster, torch their headquarters. This is much faster than bombing them. Torching kills the leader in one shot instead of twice when bombing. This may be difficult if it is enclosed by other buildings. If the headquarters is enclosed, make sure you send in more than one group of hoods to torch it. Killing most of the opposing gang's hoods will also weaken their headquarters' defense.
Extort some properties (it will not matter if they want to pay you the money). After that week, look on the map and double click on the property that was extorted. A picture of the owner will appear with details about the shop. Move the cursor next to the picture in the "blank space" and the cursor will change. Click when this happens and the property will become yours. Do not forget to send a man to run the place the following week.
To get easy properties without extortion, use the following steps. Beside the picture are invisible buttons that say (in order) sack hood, return to base, and hood pay. Press the "Return To Base" button and then you own it. Doing this also (one week after the process) allows you to buy the empty area in the middle of tenement blocks.
Make more money
Enable the "$50,000" code and buy large amounts of red cars. You can only buy ten at a time. Return to the car screen and sell all the cars that you bought. You can only make $2,500 back from selling them (half the money back you paid for).
Go to the Lieutenant's page of the Gang Organizer, open the Cars menu, and go to the "Black Market". Instead of clicking on the car you want and waiting for the money clip to appear, quickly drag the car of your choice from the "Black Market" page to the picture of it on the Lieutenant's side. If this was done fast enough, the item will be yours, with no money being subtracted. This can also be done with guns, but does not work with recruited hoods. Note: Try this first without having enough money for the object, as it takes some practice. After each time this trick is used (whether successful or not), exit the "Black Market" and return.