In 1933 the President (FDR) signed Executive Order 1602 “forbidding the Hoarding of Gold Coin, Gold Bullion and Gold Certificates” by U.S. citizens.
Note – it wasn’t a LAW, not passed by Congress, but it did threaten 10 years in prison.
Put another way… if you got something they want, they will take it.
Nah… it would never happen again, you say. Uh huh… It was a crisis. And by gosh we aren’t in a crisis are we?