Fourth branch of government

In politics of the United States, "fourth branch of government" is an unofficial term referring to groups or institutions perceived variously as influencing or acting in the stead of the three branches of the US federal government defined in the Constitution of the United States (legislative, executive and judicial). Views as to whether the influence is due or undue or the actions are for good or ill also vary.

Source: Wikipedia — Fourth branch of government (CC BY-SA 4.0)