William O. Douglas,
Barr v. United States — Opinion of the Court
“ It required among other things that all persons resident in the United Kingdom sell to the British Treasury at prices fixed by it all foreign currency which they were entitled to sell, and prohibited, with certain exceptions, exportion of foreign currency from the United Kingdom and the purchase and sale of foreign currency in the United Kingdom from or to any person other than an authorized dealer and at prices fixed by the British Treasury. ”
