Moonshine was originally a slang term for high-proof distilled spirits that were usually produced illicitly, without government authorization. In recent years, however, moonshine has been legalized in various countries and has become a commercial product. Legal in the United States since 2010, moonshine is defined as "clear, unaged whiskey", typically made with corn mash as its main ingredient. Liquor control laws in the United States always applied to moonshine, with efforts accelerated during the total ban on alcohol production mandated under the Eighteenth Amendment of the Constitution. Since the amendment's repeal and moonshine's recent legalization, the laws focus on evasion of taxation on spirits or intoxicating liquors. Applicable laws are enforced by the Bureau of Alcohol, Tobacco, Firearms and Explosives of the US Department of Justice. Enforcement agents were once known colloquially as "revenuers".