If you are looking for information regarding this file in a "paper" context (such as a technical report, academic study, or crack/release notes), here is what that typically refers to:

If you are researching game design or procedural generation, City of Gangsters is sometimes cited in papers discussing resource management mechanics or procedural city building in Unity-based games.

Be cautious when downloading .zip files from unofficial sources, as they may contain malware. It is always safest to acquire software through official storefronts.