That is an odd way of describing the Justice Department's operations under Gonzalez.
Can we just accept that no matter what Administration is in the White House, there is a certain amout of politicization of Cabinet Departments? The Justice Department is an executive agency--is is not the Courts, who are supposed to be neutral. An executive agency is tasked with carrying out the orders and policies of the White House.
Law enforcement is a political activity to a certain extent. The White House tells the Justice Department what is more important and what is less important in some respects. The Justice Department, just like every other agency, is given a priority list.
Did Gonzalez step over the line on some matters? Maybe and maybe not, but we cannot investigate him for politics.