The latest containment effort began in mid-July of this year, after gold had moved higher in price from the beginning of June and was threatening to take out key technical levels, which would have triggered a flood of buying from hedge funds.
The Fed and its agents rig the gold price in the New York Comex futures (paper gold) market. The bullion banks have the ability to print an unlimited supply of gold contracts which are sold in large volumes at times when Comex activity is light.
Generally, on the other side of the trade the buyers of contracts are large hedge funds and other speculators, who use the contracts to speculate on the direction of the gold price. The hedge funds and speculators have no interest in acquiring physical gold and settle their bets in cash, which makes it possible for the bullion banks to sell claims to gold that they cannot back with physical metal. Contracts sold without underlying gold to back them are called "uncovered contracts" or "naked shorts." It is illegal to engage in naked shorting in the stock and bond markets, but it is permitted in the gold futures market.
The fact that the price of gold is determined in a futures market in which paper claims to gold are traded merely to speculate on price means that the Fed and its bank agents can suppress the price of gold even though demand for physical gold is rising.