The Mad Island Gang is a small gang that makes an appearance in Grand Theft Auto 2. Their only turf is in Mad Island. Whenever the player is spotted by the gang, they automatically attack, regardless of how much respect the player has. They also play no part in the game. The gang's character model is identical to that of the Rednecks. Unlike the Rednecks, the Islanders have no redheaded members.
Mad Island is not available on the PlayStation 1 version of GTA 2, and, as a result, the Mad Island Gang isn't in the PlayStation version, either. Since Mad Island is on the border with Azeri Heights, Russian Mafia members can sometimes spawn in the south-eastern part, which often leads to violent confrontations between the Russians and the Islanders.
Game files reveal that the gang should also carry Shotguns, and that they were meant to drive gray Sharks. They are called "islagang" in the files, which likely stands for "Island Gang".