From Wikipedia
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[edit] Currency speculation
On Black Wednesday (September 16, 1992), Soros's fund sold short more than $10 billion worth of pounds sterling, profiting from the Bank of England's reluctance to either raise its interest rates to levels comparable to those of other European Exchange Rate Mechanism countries or to float its currency.
Finally, the Bank of England withdrew the currency from the European Exchange Rate Mechanism, devaluing the pound sterling, and Soros earned an estimated US$ 1.1 billion in the process. He was dubbed "the man who broke the Bank of England."
The Times of Monday, October 26, 1992, quoted Soros as saying: "Our total position by Black Wednesday had to be worth almost $10 billion. We planned to sell more than that. In fact, when Norman Lamont said just before the devaluation that he would borrow nearly $15 billion to defend sterling, we were amused because that was about how much we wanted to sell."
Stanley Druckenmiller, who traded under Soros, originally saw the weakness in the pound. "Soros' contribution was pushing him to take a gigantic position."[17][18]
In 1997, during the Asian financial crisis, then Malaysian Prime Minister Mahathir bin Mohamad accused Soros of using the wealth under his control to punish ASEAN for welcoming Myanmar as a member. Soros has denied bin Mohamad's accusations.