5. According to the SEC, insider trading is “buying or selling a security, in breach of a fiduciary duty or other relationship of trust and confidence, while in possession of material, non-public information about the security. Insider trading is illegal in U.S. markets. In the 1980s, insider trading scandals cost Wall Street firms hundreds of millions of dollars.

Which firms were implicated? Are they still in existence? Can you give a total value to the scandal?