Final answer:
The Department of Justice is headed by the Attorney General and represents the United States in legal matters.
Step-by-step explanation:
The department headed by the Attorney General and represents the United States in legal matters is the Department of Justice. The Attorney General is the chief law enforcement officer of the United States and oversees the Department of Justice, which includes agencies such as the Federal Bureau of Investigation (FBI) and the Drug Enforcement Administration (DEA). The Department of Justice is responsible for enforcing federal laws, prosecuting criminals, and providing legal advice to the President and other federal agencies.
Learn more about Department of Justice and the Attorney General