Incarcerated: April 1987 to September 1988. Once the managing director of Drexel Burnham Lambert -- a firm that had more than its share of problems during the Wall Street era -- Levine spent much of his career engaged in insider trading that earned him millions. When the Securities and Exchange Commission decided to investigate Levine based on information from his previous employer, Merrill Lynch ( MER ), they discovered other discrepancies that led to Michael Milken, Ivan Boesky and, basically, the end of the go-go '80s. Levine, meanwhile, was sentenced to two years in prison, paid $362,000 in fines and forfeited his profits from insider trading. He later became president of the Adasar Group financial consulting firm and gave ethics lectures at various universities. Michael Milken Crime: Securities and tax violations. Incarcerated: March 1991 to January 1993.