NEW YORK (CNN/Money) - Authorities announced charges Wednesday against 47 people, including traders from some of Wall Street's best-known firms, in a foreign currency trading scandal that officials say defrauded investors of millions of dollars...[snip] Meanwhile, the Securities and Exchange Commission also filed separate charges of fraud in federal court against Wall Street currency trader United Currency Group Inc. and its CEO, Adam Swickle, Wednesday...[snip] The defendants, he said, were part of the multimillion-dollar scheme that spanned all levels of the currency-trading market, from top traders down to "boiler-room operations," where financial professionals make phone calls to solicit individual investors......