FBI

The Federal Bureau of Investigation is a government agency in the United States of America that is the principal investigative arm of the U.S. Department of Justice. As a federal law enforcement agency, it investigates alleged violations of federal criminal laws governing banking, gambling, white collar fraud, public corruption, civil rights, interstate transportation of stolen property, and elections. It provides leadership and criminal justice services to federal, state, municipal, and international agencies and partners. Its top investigative priority is to protect the United States from terrorist attacks, and agents have the authority to use wiretaps in investigations.