Sheryl WeikalBelieve it or not, there's already a mechanism in place for the federal government to seize and appropriate the assets of billionaires and redistribute them for the public good. SCOTUS accidentally created it with one of its worst decisions of the 21st century, Kelo v. New London.
Amgine#Wikipedia: https://en.wikipedia.org/wiki/Kelo_v._City_of_New_London
AIRI, after the decision there was an effort to turn Justice Breyer's home/estate into an amusement park which, obviously, would have had greater financial benefits for the community.