The Secret Service is part of the Department of Treasury.
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The secret service.
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No, that is different department.
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The Secret Service, a part of the US Treasury Department.
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Interior
The U.S. Secret Service was a division of the Department of the
Treasury from its creation on April 14, 1865 until March 1, 2003,
and it has been a division of the Department of Homeland Security
since then.