Operation Backfire was an FBI investigation into a group of violent criminals. It all started in 2001 when a group of people were arrested for a series of bank robberies and other violent crimes. The FBI then began investigating the group, to see if they were linked to any other crimes. They tracked down leads and collected evidence, like fingerprints and video footage. Eventually, the FBI put together enough evidence to charge the criminals with the crimes they had committed. The criminals were convicted in court and sent to prison, making the FBI's Operation Backfire a success!