Follow The Money, page-6

Actually professor, I've got something you can really get your moral, PC, teeth into.

The CBGA, the Central Bank Gold Agreement. It's a cartel like OPEC to ensure that the price doesn't collapse.
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In recognition of this, major European central banks signed the Central Bank Gold Agreement (CBGA) in 1999, limiting the amount of gold that signatories can collectively sell in any one year. There have since been two further agreements, in 2004 and 2009.
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There's also the Washington Agreement on gold, a moral zealot such as yourself should be thoroughly outraged by such collusion, in breach of the antitrust laws.
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• The agreement resembles a cartel that materially affects the supply of gold in the global market. In this regard, the agreement stretches the borders of antitrust legislation.

https://en.wikipedia.org/wiki/Washington_Agreement_on_Gold

http://www.gold.org/reserve-asset-management/central-bank-gold-agreements