Also, a source for the claim that the Yakuza groups have officially known headquarters: https://www.washingtonpost.com/news/global-opinions/wp/2017/04/08/japan

Also, a source for the claim that the Yakuza groups have officially known headquarters: https://www.washingtonpost.com/news/global-opinions/wp/2017/04/08/japans-yakuza-arent-disappearing-theyre-getting-smarter/ https://www.washingtonpost.com/news/global-opinions/wp/2017/...