Trevor Aaronson

The case of Earnest James Ujaama, a prolific cooperating witness, illustrates the irony of a system that grants leniency to those with information to trade.

In the Liberty City Seven terror case, a group of street hustlers working a scam fell victim to an FBI informant posing as an agent of Al Qaeda.

Agents have the authority to aggressively investigate anyone they believe could be a valuable source for the bureau.

The FBI coordinates with immigration authorities to locate informants who are no longer of value to the bureau.

A classified policy guide creates opportunities for agents to disguise payments as reimbursements or offer informants a cut of seized assets.

Flaviu Georgescu faced a possible life sentence after being caught up in a DEA sting.

The U.S. government says Flaviu Georgescu was an arms dealer who wanted to sell weapons to terrorists. So why did he call the CIA to tell the agency what he was doing?

Tahir spent the last decade tailing Muslims in counterterrorism cases. Now he says he’s a victim of the same biases that underpinned many of the cases he worked on.

The indictment of Erick Hendricks for ISIS recruiting reveals that an undercover FBI agent was communicating with Hendricks just before two men attacked the Garland event in 2015.

A scathing ruling in British Columbia says “the world has enough terrorists. We do not need the police to create more out of marginalized people who have neither the capacity nor sufficient motivation to do it themselves.”