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The F.B.I. is the Federal Bureau of Investigation. It is the main investigating agency of the Department of Justice in the United States. The F.B.I. enforces more than 200 federal laws. But its two most important jobs now are to prevent terrorism and spying. The F.B.I. assists other law enforcement agencies in America and foreign countries. It has the world's largest collection of fingerprints and is also known for its crime laboratories. The F.B.I. employs about 27,000 people. They work in 56 offices in America and more than 40 offices in other countries. More than 11,000 men and women serve as special agents. They investigate crimes like bank robberies, but also crimes involving computers, the environment and terrorism. The F.B.I. has been criticized for its part in the failure to stop the hijackings on September 11th, 2001. It has made many changes since then. New laws have made it easier to share information about possible terrorist threats.