Curveball (informant) - The Name "Curveball"

The Name "Curveball"

Allegedly because the Iraqi informant disliked Americans, Germany's intelligence service (BND) classified him as a "blue" source, meaning the Germans would not permit U.S. access to him (red sources were allowed American contact). Later evidence indicated that he was in fact pro-American, and that the Germans were guarding their source. The Germans, however, did pass on information to the American intelligence agencies and the informant was given the codename "Curveball". Despite it being an American term, the Americans deny coining the name, and its origin is uncertain. The base cryptonym "ball" had been used during the Cold War when dealing with informants who had intelligence about weapons.