Edited sentence: During the Prohibition era in the United States, gangsters effectively and lucratively exploited the demand for alcohol by filling the gap in supply.In the 1950s, they did the same with gambling.The ranges and spheres of activities of gangsters are diverse, and frequently are to be found filling the gaps between legislature and physical reality.They also actively engage in other demand-driven markets such as trade in narcotics, pimping, people-trafficking, the supply of false documents, and so on and so forth