The Roaring 20s brought cultural advancement, economic growth, and technological breakthroughs. Entertainment expanded with the rise of radio, movies, and sports. However, Prohibition in the US from 1920 to 1933 resulted in the growth of organized crime as gangsters smuggled alcohol and controlled speakeasies. Figures like Al Capone built powerful criminal empires before the law was finally repealed due to its harmful unintended consequences.