Which federal agency is primarily responsible for investigating and enforcing federal laws, including terrorism, organized crime, and cybercrime?

• A. FBI (Federal Bureau of Investigation)
• B. DEA (Drug Enforcement Administration)
• C. ATF (Bureau of Alcohol, Tobacco, Firearms and Explosives)
• D. ICE (Immigration and Customs Enforcement)

Answer: (A)

Investigating and enforcing federal laws across a wide range of crimes, including terrorism, organized crime, and cybercrime, is the domain of the FBI. As the principal federal investigative agency under the Department of Justice, the FBI leads national security efforts, handles major criminal investigations, and coordinates with other agencies as needed to address complex threats in cyberspace and across borders. Other agencies focus on specific areas—drug enforcement is led by the DEA, firearms and explosives by the ATF, and immigration enforcement by ICE—but they don’t oversee the broad spectrum of federal criminal investigations that the FBI handles. This combination of a wide mandate and central leadership in federal investigations is why the FBI is the best answer.