A speakasy was an establishment which served illegal alcoholic beverages.

When Kira Nerys and Miles O'Brien transported back in time to 1930 San Francisco from 2371, they were outside a speakeasy during Prohibition. (DS9 episode: "Past Tense, Part II")

In the Bashir 62 holosuite program, Vic Fontaine's bassist Vernon Owens played bass in speakeasies in Chicago. (DS9 novel: The Long Mirage)

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