From Redstate:

In the same way that J. Edgar Hoover did special favors for the presidents he served to expand the FBI, so too the current bureaucracy is attempting to amass more authority by ensuring that it stays in the good graces of the DNC. Justice is supposed to be blind, but when the people can see obvious examples of unequal application of the law, the people will not tolerate such hypocrisy.

Congress created the FBI, and Congress has the full authority to reorganize, modify, or disband the organization. Nothing in the United States Constitution requires this nation to have an FBI. In fact, the argument could be made that the Constitution does not permit an FBI since the Tenth Amendment reserved the power to enforce the health, safety, and general welfare of the people to the states (police powers).