Imagine a government agency, or any organization, where there is no supervision of front-line personnel and no ultimate authority bearing responsibility for institutional decisions. That would be absurd anywhere. But that is especially true in the case of the Justice Department because all of its critical operations involve exercising judgment in the context of broad legal authority.
Should we investigate or not? If so, for what and for how long? Is there sufficient evidence to conclude that a case can be proved beyond a reasonable doubt? If we prevail, what is a just sentence? Who should we recommend be pardoned or have a sentence commuted? Such decisions in a society grounded in individual liberty are among the most intrusive possible. Thus, supervision of those career-level decisions is not only permitted but also a necessity, including review at times by the highest authority.