I could swear I read an article about this last week, but in it, a timeline was established for when this was likely done (if in fact it was).
Should come as no surprise that the years cited were during the Clinton administration, when Summers and Rubin were around.
meh
Yes there was an article this one I bet
http://www.marketoracle.co.uk/Article14996.html
Also worth reading
http://www.economicpolicyjournal.com/2009/11/whats-fed-hiding.html
http://www.financialsense.com/fsu/editorials/kirby/2009/1009.html
http://www.marketskeptics.com/2009/10/gold-market-reaching-breaking-point.html
http://www.scribd.com/word/embed/21133990