They mostly run construction companies now, an industry where there's been a wild amount of corruption for a long time- in part why most rivers have completely

They mostly run construction companies now, an industry where there's been a wild amount of corruption for a long time- in part why most rivers have completely unnecessary concrete banks, ostensibly for "flood control". See "Dogs and Demons" by Alex Kerr (http://alex-kerr.com/html/dogs___demons__english_.html http://alex-kerr.com/html/dogs___demons__english_.html). Anecdotally, I know someone who owned a house in Okazaki (a city outside of Nagoya). Someone decided they wanted the land for a construction project, so they resorted to threats to get him to move- such as smashing his car windows. No way that was a random punk smashing windows- when I lived in Okazaki, a defaced public bathroom would make the local news. Classic Yakuza tactic, and unfortunately he ended up moving because of it.