So a former manager of both Fedor and Crocop did an interesting article about the Yakuza ties to PRIDE FC. Considering Takada and Sakakibara have long since sold PRIDE to Zuffa, and started another league (RIZIN), this information is actually probably still somewhat relevant.
Even if you don't follow the new stuff, this is an interesting perspective piece about the political climate in one of the biggest fighting promotions that ever existed on Earth.
http://www.mixedmart...uza-ties-388511