The indictment criticizes Cheney's investment in the Vanguard Group, which holds interests in the private prison companies running the federal detention centers. It accuses Cheney of a conflict of interest and "at least misdemeanor assaults" on detainees by working through the prison companies.
Yes, apparently that Vanguard Group, the index mutual fund powerhouse. You see, Cheney apparently invested in an index fund, and the stock market index contained a company that manages prisons, and some of the prisoners claimed that the company's employees abused them. Direct link to the Vice President's office.