The term "speakeasy" became popular during the 1920s to identify bars, restaurants, halls and ballrooms where alcoholic drinks were sold illegally.  The 18th Amendment of the United States Constitution forbid the sales of beverages with 0.5% of alcohol.

To be admitted in an establishment that served alcoholic beverages, the customers were expected to speak low or discretely in order not to attract attention.  The term "speakeasy" was born.  Speakeasies were typically presented as an ice cream parlor, pastry shop, restaurant or coffee shop.  Before entering, the customers were "evaluated" through a small window.  They would only gain entry by using the right card, knock or password.

In 1929, it was estimated that there were anywhere between 35,000 and 100,000 speakeasies in New York City alone.