Executive Order 6102 required U.S. citizens to deliver on or before May 1, 1933 all but a small amount of gold coin, gold bullion, and gold certificates owned by them to the Federal Reserve, in exchange for $20.67 per troy ounce. Under the Trading With the Enemy Act of October 6, 1917, as amended on March 9, 1933, violation of the order was punishable by fine up to $10,000 ($166,640 if adjusted for inflation as of 2008) or up to ten years in prison, or both.

Abolishing the gold standard is not "equivalent" to "seizing of all gold". Both things just happened concurrently:

http://www.greatdepressiononline.com/gold-and-the-great-depr...

First, in 1933, at the height of the Great Depression, the U.S. Government, under the Gold Confiscation Act, confiscated gold money from its citizens and replaced it with paper Federal Reserve Notes. It became illegal for individuals to own gold, except for small quantities that coin collectors and dental practitioners could hold. This alone eliminated the public’s capacity to hold government inflation of the money supply in check; they could no longer redeem inflated paper money for gold.

War productions does not make prosperous societies simply because the allocation of resource is redirected to military purpose, not to civilian needs.