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Where do people think the agency derives 100% of it's power from? The President!
You clearly do not understand how the American system of governance is supposed to work. Every department has enabling legislation. Below is a link to a law passed by Congress and signed by the President establishing the DOJ.
https://www.justice.gov/sites/default/files/jmd/legacy/2013/...
A CEO sending out that memo would be similarly ill-advised. For one, that's what counsel is for. For another, workers are intentionally encouraged to interpret laws and report discrepancies via government whistleblower programs.