What functions does the FBI serve in federal law enforcement?

The FBI primarily serves the function of investigating and enforcing federal laws. This encompasses a wide range of areas including terrorism, cybercrime, organized crime, public corruption, civil rights violations, and more. The agency operates under the jurisdiction of federal law, meaning that it addresses crimes that cross state lines, involve federal statutes, or are of national significance. This role is vital for maintaining law and order at the federal level and ensuring that federal laws are uniformly applied across the United States.

While the FBI does engage in various support activities, such as assisting local law enforcement agencies or providing training, its core mission revolves around federal law enforcement. The other choices, such as enforcing state laws, conducting solely international investigations, or only training local law enforcement, do not encapsulate the primary function of the FBI as effectively as investigating and enforcing federal laws do. Therefore, the focus on federal law enforcement distinctly outlines the essential role of the FBI within the broader landscape of law enforcement agencies.