Among the individuals prosecutors allege were involved with the tax credit deals is Leon Greenblatt, a maverick Chicago investor who with his partners made millions in the 1990s by trading the stock of a bankrupt company. The Tribune reported in September that over the years Greenblatt has been subject of dozens of lawsuits, filed many himself, been harshly criticized by federal judges in opinions, and that IRS agents were examining the tax credit deals linked to Stern.