J Edgar Hoover used the FBI to implement an intrusive nationwide surveillance program under the justification that it was for the sake of national security. This surveillance program included celebrities and many people of prominence. It remains unclear how many of these people posed a threat to national security and whether the FBI should have been allowed to surveil them. Hoover's surveillance program is an example of what?

A. Abuse of Power
B. Violation of Sovereignty
C. Embezzlement
D. Kickbacks