I believe it is the people who created this nation and the system as it is today.
"We the People of he United States ..... do ordain and establish this Constitution for the United States of America."
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The current so called Federal Reserve is not a publicly controlled institution. It is a bank controlled institution, with the majority control held by banks in the New York district.
There was considerable controversy, and back and forth, through the 1800's, over whether private banks, or the federal government, would create money. With the events of Jeckyll Island in 1913, the Federal Reserve came into being, putting control of our money in the hands of banks.
This can be blamed for both the Great Depression of the 1930's, and the Second Great Depression of the 2010's that Cassandras such as myself are anticipating.