Agents enter dual agency when they represent both the seller and the buyer. Dual agency can happen even if the there are two agents involved -- a listing agent and a buyer's agent -- if both agents work for the same broker. That's because it is the real estate broker who creates agency.
The notion of Jewish control of the United States is utter nonsense. Jews are a capable people who have, through hard-work, gained a disproportionate role in some aspects of American life. But they in no way dominate the country.
From the start of the persecution of the Jews in Germany, Churchill took the Jewish side of supporting a boycott of German goods, writing in 1937 of 'a perfectly legitimate use of their influence throughout the world to bring pressure, economic and financial, to bear upon the governments which persecute them'.