The bootleggers hid their whiskey when they heard the revenuers were coming to inspect.

revenuers 是名词 revenue 加后缀 -er 构成，revenue 指"财政收入、税收"，后缀 -er 表示"从事...的人"，所以 revenuer 指"负责征收税款的人"，即"税务官"。 revenuers 是 revenuer 的复数形式，在句中指"税务官员们"。