Did the US Mafia actually start in New Orleans?

A business employee sweeps up after police cleared the street at the conclusion of Mardi Gras in the early morning hours of March 5, 2003 in New Orleans, Louisiana. Bourbon Street, in the French Quarter district, is the best known street party site of Mardi Gras. David McNew / Getty Images

When we think of the mob today, most Americans think of New York City -- and why not? After all, films, books and TV shows often depict New York as the heart of mob country. Yet, as the guys discover in today's episode, the story of the Italian-American mafia has a surprisingly different (and often forgotten) origin point.