After the Galleon insider trading arrests, the question is who is next. According to this Reuters article, SAC Capital Advisors -- Steven A. Cohen's $12.9 billion Connecticut-based hedge fund - is under investigation by the FBI. SAC Capital has been investigated in the past, but no charges have ever been filed. This interesting, and long, article focuses on FBI Special Agent B. J. Kang who had had been at the center of a number of high profile securities cases, including the most recent case against Raj Rajaratnam and Galleon. Reuters investigative reporter Matthew Goldstein comments on the article and the SAC Capital investigation in this video.