i don't know if it counts as a mandala effect or just language being reigned in to avoid conclusions the language modifiers don't want people to make, but I distinctly remember the FBI was spoken of as a continuation of the Pinkerton agency, a lot of their standard operating procedures and trade craft, how they operate by building networks of informants, leverage, entrapment, etc -- all comes from the Pinkerton playbook, and I remember the US Secret Service being stood up around the same time with the Department of the Treasury, the enforcement/investigative office meant to prosecute counterfeiting.
Now both are post-civil war, and vaguely overlapping (but not related) to the pinkerton agency, or at least the language now is far less certain of their connection.