The FBI recently sought to develop sources inside Christian churches and Catholic dioceses as part of an effort to combat domestic terrorism, according to internal documents released by House ...

Experts say it's important to act swiftly to identify whether secret sources were compromised. Because human sources report on foreign adversaries, experts say their lives could be at risk. Experts ...

Documents related to the work of clandestine sources are some of the most sensitive and protected in the government. F.B.I. agents found some in boxes retrieved from Donald J. Trump’s home. By Julian ...