Gangster/crime films are usually set in large, crowded cities, to provide a view of the secret world of the criminal: dark nightclubs or streets with lurid neon signs, fast cars, piles of cash, sleazy bars, contraband, seedy living quarters or rooming houses. Exotic locales for crimes often add an element of adventure and wealth. Writers dreamed up appropriate gangland jargon for the tales, such as "tommy guns" or "molls.