The Brotherhood

The Brotherhood is an organisation formed by Katsuro Minoru who have been moving for over fifty years in secret, gathering followers and initially only appearing to be a group which had high interests in artefacts—but their seeming innocence was shattered when the group began orchestrating raids on famous archaeological sites, often resulting in deaths. The groups ultimate motive was to resurrect the ancient beast, Sensō and reestablish a new world order where they could rule.

Members
The Brotherhood's main chain of command was made up of several, very powerful missing nin, all of which were S-rank international criminals. They had many more members who were also at least Chūnin class, also proven combatants themselves. However the main missions were undertaken and executed by the powerful chain of command.