The vast U.S. intelligence operations of today have their roots in World War I, when the Army flew aerial photography missions and cracked German codes and the State Department carried out its own daring espionage missions. Back home, the military and Justice Department worked to secure the nation against spies and saboteurs – real and imaginary.

Mark Stout, who worked for 13 years as an intelligence analyst with the State Department and CIA, examines this little-known period in American history and its lasting impact.

Stout currently is director of Johns Hopkins University’s Global Security master’s program. He spent three years as historian at the International Spy Museum in Washington, D.C.

Co-presented by the Truman Library Institute and co-sponsored by the National World War I Museum at Liberty Memorial.

Watch at c-span.org