Steve Lewis: Previously on Inside the FBI, we looked back at the investigation that led to the arrest of Ted Kaczynski, better known as the Unabomber—one of the nation’s most notorious domestic ...

A tragic crash revealed an operation no one was meant to know about. When a military helicopter collided with a civilian aircraft over Washington, investigators discovered it had been flying a covert ...

The FBI is reassigning agents back to counterterrorism after previously diverting them to immigration enforcement, following growing concerns about potential threats from Iran, according to sources ...

Calling it an immediate “critical mission need,” the Department of Homeland Security (DHS) is performing classified queries on its unclassified data to identify individuals supporting the terrorist ...