Opposed to or working against saloons (bars), typically as part of temperance or prohibition movements.
From anti- (against) + saloon (a drinking establishment). Saloon likely comes from French salon. The compound is most associated with Prohibition-era America (1920-1933).
The antisaloon movement was genuinely powerful—it managed to ban alcohol in the entire United States for 13 years through pure activism, making it one of history's most successful (though controversial) protest movements.
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