Another interesting example of the phenomenon you describe is that until 2003, the Secret Service was part of the Department of the Treasury, as the agency was

Another interesting example of the phenomenon you describe is that until 2003, the Secret Service was part of the Department of the Treasury, as the agency was founded in 1865 to combat the then-widespread counterfeiting of U.S. currency. https://en.wikipedia.org/wiki/United_States_Secret_Service https://en.wikipedia.org/wiki/United_States_Secret_Service