Counterintelligence Through History

Counterintelligence hunts spies instead of recruiting them, and every major service runs a division for it. The FBI guards the United States against foreign networks on American soil.

The Stasi built files on millions of East German citizens and recruited informants in factories and apartment blocks. The KGB planted deep cover illegals abroad for decades, while Mossad became famous for relentless pursuit of Nazi war criminals after 1945.

The agency pages in this database trace how each service balances catching enemy agents with protecting its own sources..