Which agency is represented by the abbreviation FBI?

The abbreviation FBI stands for the Federal Bureau of Investigation, which is a premier federal investigative agency in the United States. The FBI is responsible for handling a wide range of criminal activities, including terrorism, cybercrime, organized crime, public corruption, civil rights violations, and more. It also plays a vital role in national security and intelligence operations.

This designation is widely recognized and is a key part of the law enforcement structure within the U.S. government. The other options misrepresent the missions and functions associated with the FBI. For instance, the term “Federal Bureau of Intelligence” does not correspond to any existing agency and conflates intelligence operations with criminal investigations, which are the primary focus of the FBI. Similarly, "Federal Bureau of Immigration" and "Foreign Bureau of Investigation" do not exist; these descriptions may confuse the public about the purpose and responsibilities of the FBI. Understanding the correct designation is essential, especially in contexts involving law enforcement, security, and federal investigative processes.