Mark Twain once said, "It is the prohibition that makes anything precious." The United States learned that lesson the hard way not long after January 17, 1920, when it made the nation’s fifth-largest industry largely illegal. Smuggling alcohol during Prohibition became its own industry, inciting the growth of illicit activity and organized crime. But necessity, as they say, is the mother of invention, and some of the ways people hid alcohol during Prohibition were very inventive. If it hadn’t all come to an end in 1933, hiding liquor might have become another major industry.