What was Ivan Boesky found guilty of in the 1980's?

Ivan Frederick Boesky (born March 6, 1937) is a former American stock trader who is notable for his prominent role in a Wall Street insider trading scandal that occurred in the United States in the mid-1980's.

Although insider trading of this kind was illegal, laws prohibiting it were rarely enforced until Boesky was prosecuted.Boesky cooperated with the SEC and informed on others, including the case against financier Michael Milken. As a result of a plea bargain, Boesky received a prison sentence of  3 1⁄2 years and was fined US$100 million. Although he was released after two years, he was permanently barred from working in securities. He served his sentence at Lompoc Federal Prison Camp near Vandenberg Air Force Base in California.

Boesky never recovered his reputation after doing his prison time, and paid hundreds of millions of dollars in fines and compensation for his role and a number of separate insider dealing scams. Later, Boesky, who is Jewish, embraced his Judaism and even took classes at the Jewish Theological Seminary of America where he had been a major donor; however, in 1987, following the fallout from his financial scandal, The New York Times reported that "after Ivan F. Boesky had been fined $100 million in the insider-trading scandal, the Jewish Theological Seminary, acting at his request, took his name off its $20 million library."

In 1991, he divorced his wife and she agreed to pay him $23 million and $180,000 a year for life.