Why do Black Organization members use alcoholic drink names as code names? As far as I know, all of Black Organization's members using the names of alcoholic drinks as their code name, like Gin, Vodka, Sherry, and Vermouth. Is there any reason behind this?
There is a reason behind this.
Gosho Aoyama stated that there is a reason behind all the names of the, as we call it, Black Organization. He also said, that if we would knew the real name of the Organization, we would know the boss.

Now, we just have to wait until Mr. Aoyama reveals the real name. And it better be something better than "Bar", "Club" or "Organization of Alcoholic Drinks".