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Noun: deep state
  1. (sometimes associated with conspiracy theories) a group of people, typically members of government agencies, the military, large corporations or other agencies, believed to exert power and political influence that is difficult for an elected administration to counter
    "I think they will feel that there has been a great conspiracy by the deep state of the UK, the people who really run the country, to overturn the verdict of the people"

Encyclopedia: Deep state