Black Dragon Society - 黒龍会
The Black Dragon Society (Kokuryukai) was a prominent paramilitary, ultra-nationalist right-wing group in Japan. For information see wikipedia.
Their emblem was found in the trailhead pdf file and they may be behind many other actions. Two possibilities are that they are funding the KantSayWhere Institute. and that they provided special ops troops aboard the Nisshin Maru as seen by Tyler Michaels.