There was a lot of graft documented clearly in "To Die in Chicago"..Camp Douglas. Included are three cronies of Honest Abe. These ghouls were working a scam to make deals with the food vendors and sell the good food elsewhere while depriving Confederate POW's of fresh meat and vegetables. There was a highly inordinate amount of scurvy and other diseases directly related to malnutrition. Very likely, this business took place at other prisons. Two of the prison officials tried to bring charges (evidently due to jealously versus compassion) and were unsuccessful.