revenuer

Etymology
From, reflecting the U.S. Treasury Department's former Bureau of Internal Revenue, because the administrative mechanism for enforcing Prohibition originated in excise tax administration; Wikipedia gives details at Bureau of Alcohol, Tobacco, Firearms and Explosives § History.

Noun

 * 1)  A government official who enforces laws prohibiting the illegal distillation of alcohol.

Usage notes

 * This term is especially associated with the efforts of the IRS to prevent illegal production and distribution of alcohol during the period of Prohibition in the U.S.