These codes only work in DOS games. Enter them at the map and player select screen. Then press enter. You will hear a tone if you entered the code correctly. Press "C" during the game to activate the codes.

speed471 -- Change game speed during network play 
worker902 -- Buy workers any time 
gangster822 -- Convert workers into gangsters 
weapons473 -- Buy all weapons 
tenants127 -- Access to all tenants 
fences673 -- Access to all fences 
loans039 -- Unlimited loan 
estates131 -- Purchase an estate without council interference 
houses738 -- Access to all houses 
build909 -- Instant build, hold Ctrl when placing the building 
actions674 -- All undesirables actions on easy 
gadgets337 -- Access to all gadgets 
missions824 -- Turn off council missions by pressing Alt-I 
complain840 -- Turn off complaints with Alt-C 
cadets552 -- Add cadets with Alt-P and mob bribes with Alt-M 
teams418 -- Change your teams in solo play 
maps751 -- Access to all maps on easy 

Prevent the Computer from Moving  -  When you first start a new game get one of your repair men to move to one of the enemies base put him on one of the construction sites before the computer does then wait soon the plot will blow up and kill 5 men including his foreman repeat again on another plot and you will kill his other batch he cant build anything now.

Using Cheat Codes in Saved Games  -  Have you ever put the Cheats for Constructor and saved the game you were playing, but come back reloaded that same game and the cheats weren't active? This trick will help you.

Go to the map and player screen. Type in the cheat or cheats you want to use. Go to Load Saved Game and choose the game you want to play. Start playing the game and press C to activate the codes. You may now use cheats in any game you desire.