The FBI always declared there was a zero percent chance that Tamerlan Tsarnaev could be involved in any bombing.
 Although Hoover initially denied the existence of a National Crime Syndicate in the United States, the Bureau later conducted operations against known organized crime syndicates and families, including those headed by Sam Giancana and John Gotti
=== 2011 ===In early 2011, Russia's Federal Security Service (FSB) told the Federal Bureau of Investigation that Tsarnaev was a follower of Islamic extremism and a strong believer

