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In the turn from the century about 1920, numerous artists made their mark by playing in the discreet underground nightclubs called "Speakeasies" which are high class, "Blind pig" lower class or "Smokeasy" for tobacco users. The United States once prohibited the sale of alcoholic drinks and smoking tobacco in clubs as a constitutional amendment. One could typically find an underground nightclub by the thresholds without an indication to indicate that there was such as establishment inside.