Well, the 4th Estate would be the media.... I suppose the 4th Branch would be corporations/Non-Governmental Organizations. Either or both can exist
separate from yet essentially equal to the other 3 which make them the only entities I can think of which could properly hold that position.
Within that category, I would have to say the Federal Reserve Bank is the most direct representation.
However, if your political studies take you further, then it can be argued that the administrative bureaucracy and agencies could be considered an
unofficial 4th branch due to it's power delegated to it by congress and it's impressive clout.
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