Currency Trading Schemes Leave Unwary Investors Holding the Bag
Fraudulent schemes involving currency trading are on rise, replacing precious metals as commodity of choice among investment frauds; attributed to growing awareness of currency market, as large companies increasingly try to minimize effects of changes in value of dollar against foreign currencies, and as major speculators generate headlines; law enforcement officials say schemes may have increased since US Supreme Court decision in February 1997, removing Commodity Futures Trading Commission from regulating certain parts of foreign currency market; fraudulent currency trading scheme involving AEL Fund Inc, which was operated by 35-year-old Russian immigrant, Alex Efrosman, described (M)