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the FBI in the US
the US government department responsible for protecting the US from attacks by terrorists, or the work of this department
the larger and less powerful part of the US Congress (=the organization that makes laws in the US)
the Internal Revenue Service: the US government department that collects taxes
legal the part of government that makes and changes laws. The other parts of government are the executive and the judiciary.
in the US, the government department that manages the country’s relations with other countries. The Secretary of State is the head of this department.