how do you recognize a yakuza? how do you know if someone is a yakuza?translated ): it's the smell. >> logan: it's the smell? >> purple: yes. >> logan: what kind of smell? >> purple: the smell of another beast. >> jake adelstein: when you join the yakuza, they become your family. >> logan: no american knows more about the inner workings of the yakuza than jake adelstein. he spent the last 15 years in tokyo investigating and writing about the mob. >> adelstein: generally speaking, yakuza get rid of bodies by dumping them in the foundations of buildings. they own lots of construction companies. so, you know, you're pouring a new building, you throw the body in, like, the cement, and nobody ever finds it. >> logan: so, when you look around at all these tall buildings in tokyo... >> adelstein: you could be looking at graveyards. >> logan: it's impossible to miss the mark of a yakuza. severed fingers-- tradition demands, when a mistake is made, they chop off their own finger to atone, and present the severed part to their boss. many have ornate tattoos that o