"Gonzales should have stayed out of the leak investigation once it began to focus on potential witnesses against him. By overseeing it, Gonzales put himself in a position to hurt the careers and reputations of subordinates whose cooperation was needed in the separate investigation of him. They are likely to recognize this added vulnerability -- it's hard enough as it is to provide evidence against your boss -- which will in turn intimidate them from saying anything that invites retribution from Gonzales."

RICO.

(Update: For completeness here's the Wikipedia entry on RICO)

Gonzales Investigated Subordinates Who Were Likely To Testify Against Him