Who is Sandy Weinberg from Metal Men: Marc Rich and the 10-billion-dollar Scam and what is their importance?

Sandy Weinberg first got wind of Marc Rich and his operations when two con-men who were associates of Rich were interrogated by federal authorities. When asked about a corrupt process that cheated oil customers called "daisy chaining," the men revealed that a metals trader named Marc Rich was deeply involved in the practice. Weinberg had no idea that he had a real tiger by the tail when he began looking into the business practices and international operations of Marc Rich.