And don't forget that in 1936 Roosevelt signed into a law a...

And don't forget that in 1936 Roosevelt signed into a law a Congressional Act that forced all US citizens to deposit all gold holdings into the US treasury on pain of gaol...it was enforced by the federal police forces and resulted in many home invasions. The price of gold was fixed and after Bretton Woods that price was US$35 per ounce till 1979 (?..thereabouts) when Nixon scrapped the fixed price regime.
This could happen again...though the global nature of modern fund management probably would make it well nigh impossible to implement.
But never underestimate the imaginative powers of federal beauracrats to come up with new and innovative ways to screw you and me out or our hard earned loot. All under the pretext, of course, of national security.....LOL