The best advice is to avoid drinking too much. The hangover is telling your body to reduce your consumption of alcohol.

It was a secret organization and members wore disguises when engaging in any illegal activities.

No distilled spirits beverage (vodka, gin, whiskey, tequila, etc.) contains any yeast.

All alcoholic beverages require the action of yeast to transform sugars into alcohol. Some yeast may remain in beer and wine. However, distillation prevents any yeast from being transfered from the mash (where the alcohol is produced) to the distilled spirits (gin, vodka, tequila, whiskey, etc.