What agency is responsible for enforcing federal laws?

The correct answer to the question regarding which agency is responsible for enforcing federal laws is the Department of Justice. This department plays a crucial role in the federal government's legal system and is primarily tasked with the enforcement of laws enacted by Congress. The Department of Justice oversees all federal prosecutions, supervises federal law enforcement agencies, and ensures that the law is consistently applied throughout the country.

Although the FBI, as part of the Department of Justice, does have a significant role in enforcing federal law, it operates under the broader umbrella of the Department of Justice and is focused specifically on criminal investigations and domestic intelligence. The CIA's primary function is centered around foreign intelligence gathering and national security, not law enforcement. The ATF focuses on specific areas such as firearms and explosives regulations and is also operated under the umbrella of the Department of Justice.