FBI is an acronym forFederal Bureau of Investigation which means "Federal Bureau of Investigation". The FBI is an agency that belongs to the US Department of Justice and is engaged in the investigation of federal crimes.
It is headquartered in Washington, D.C. at J. Edgar Hoover Building, a building named after a former director who served for 48 years. John Edgar Hoover is considered a patron of the FBI.
The FBI has a renowned intelligence service and its agents work on missions to protect the United States from terrorist attacks and espionage; protection of civil rights; fighting corruption in the public sector; combating cybercrime (internet attacks and virtual wars); combating organized crime (white-collar crimes, drug trafficking) and other violent crimes.
On your website, in the "Most Wanted" (Most Wanted), the FBI releases a list of people wanted for various crimes, fugitives or kidnapped. Among them, there is always a list of the 10 most wanted (Ten Most Wanted).
On May 2, 2011 Osama Bin Laden, one of the most wanted men by the FBI for being responsible for terrorist attacks in the US, was killed. United States (especially the September 11, 2001 attack) and which has been on the FBI's most wanted list since August 7 of 1998.