How does the FBI differ from the Central Intelligence Agency?

The CIA and FBI are both members of the U.S. Intelligence Community. The CIA, however, has no law enforcement function. Rather, it collects and analyzes information that is vital to the formation of U.S. policy, particularly in areas that impact the security of the nation. The CIA collects information only regarding foreign countries and their citizens. Unlike the FBI, it is prohibited from collecting information regarding “U.S. Persons,” a term that includes U.S. citizens, resident aliens, legal immigrants, and U.S. corporations, regardless of where they are located.