Their involvement is minimal. They built the tunnels that Connor uses to elude the authorities, and Samuel Adams is Achilles' (and later Connor's) primary contact with the organization. They are not involved with the Templars, as previous conspiracy theories would suggest, and seem to have little knowledge of the Assassin/Templar conflict. They have a larger role in the standalone expansion, The Tyranny of King Washington, where they are part of the resistance opposing a corrupted Washington.