Illegal Gambling (S01E04)

Millions of Americans love to gamble, but some forms of gambling are restricted or illegal, pushing them underground, where the rules are very different. Here, if you want to play you have to pay. A bookie may extend credit, but "miss a week, miss a finger" — or worse. In the shadows of the law, people will bet on anything, legal or illegal. Innocent lives are put at risk in a world where only one thing matters — money. (National Geographic)