mafia vs. yakuza

The talk about the Port Mafia compared to the Italian Mafia got me interested in looking at the structure of the Port Mafia vs Italian Mafia vs Yakuza. So here’s what I found for the Italian Mafia: 

The most interesting thing is that there’s both a right-hand-man and an underboss. Then the yakuza is like this: 

Finally, for the sake of comparison, from what I’ve gathered the Port Mafia structure is like this (probably inaccurate but bear with me): 

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