Not right away, but when the debt bubble finally pops. "In early 1933, the federal government (not the Federal Reserve) declared a bank holiday prohibiting banks from paying out gold or dealing in foreign exchange. An executive order made it illegal for anyone to "hoard" gold and forced everyone to turn in their gold and gold certificates to the government at an exchange value of $20.67 per ounce of gold in return for paper currency and bank deposits. All gold clauses in contracts private and public were declared null and void and by the end of January 1934 the price of gold, most of which had been confiscated by the government, was raised to $35 per ounce. In other words, in less than one year the government confiscated as much gold as it could at $20.67 an ounce and then devalued the dollar in terms of gold by almost 60%." "The 1933-34 devaluation of the dollar caused the money supply to grow by over 60% from April 1933 to March 1937, and over that same period the monetary base grew by over 35% and adjusted reserves grew by about 100%. Monetary policy was about as easy as it could get. The consumer price index from early 1933 through mid-1937 rose by about 15% in spite of double-digit unemployment." http://online.wsj.com/article/SB100...html?mod=rss_opinion_main#articleTabs=article
One slight problem, we're no longer on a gold standard. There's nothing to be gained by confiscating it today.