The glitter of 1920s America was seductive, from jazz, flappers, and wild all- night parties to the birth of Hollywood and a glamorous gangster-led crime scene flourishing under Prohibition. But the period was also punctuated by momentous events-the political show trials of Sacco and Vanzetti, the huge Ku Klux Klan march down Washington DC's Pennsylvania Avenue-and it produced a dizzying array of writers, musicians, and film stars, from F. Scott Fitzgerald...