Minot and its surrounding area were wide open from 1905 to 1920. The population grew rapidly due to railroad construction and availability of unclaimed land. Nearly complete court records of Ward County and Minot document the prevalence and different types of criminal activity, and offer strong support for the epithet "crime capitol of North Dakota". State attorney general William Langer helped clean up the town in 1917–1920, but by the time Prohibition arrived in the 1920s, Minot had become a center of illegal activities associated with the High Third district, exacerbated because the city was a supply hub of Al Capone's liquor smuggling operations. The hotbed of alcohol bootlegging, prostitution, and opium dens that sprang up in the Downtown area soon led people to nickname Minot "Little Chicago". The smugglers used a network of tunnels (some previously built for heating or deliveries) to transport and conceal illicit cargo entering from Canada.