Whether known as "the mob," "the Mafia," "the Outfit," or any other number of terms, organized crime played an important role in the development of American society in the twentieth century--and what went on in the U.S. at the time helped shape organized crime as it became part of the nation's--indeed, the world's--society, culture, economy, and politics. Its origins extend into early American history, and it remains a key factor in American life today. In this book, Michael Green delve into the mob, mobs, and mobsters; the times in which organized crime interests operated; and the issues and people in American history it shaped and that shaped it, ranging from federal and local law enforcement to the evolution of American immigration.