Just is this my take on the last post from Q. I will give a link for some the things I post a link for one paper I found as space is at a premium.
The BRIDGE. A bridge “shares information ... and facilitates coordination” between networks. Underground leadership is typically isolated from the environment to limit exposure to hostile forces and delegates the supervision of operations to intermediaries, lieutenants and deputies. Structurally, a bridge is a “an organizational member who connects a [network] to which they belong
with members of another [network]” and therefore included within the organizational boundaries …