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 years and was fined US$100 million. Although he was released after two years, he was permanently prohibited from working with securities. He served his sentence at Lompoc Federal Prison Camp near Vandenberg Air Force Base in California.