James Callahan, also James Michael Callaham or Jerome Callahan was a ship's clerk, described as a “trustworthy dockworker” who reported to the KGB during World War II. Callahan gave Soviet intelligence information regarding the activities of Robert Lambert, head of the California Communist party, and information regarding uranium deposits.
Callahan is referenced in the Venona #580–581 San Francisco to Moscow, 13 November 1945 decrypt; the NSA has subsequently released a reissue of the first 10 July 1995 release decrypt. Both are listed below.
- 580–581 San Francisco to Moscow, 13 November 1945 J. Robert Oppenheimer and the Atom Bomb project (Release One)
- 580–581 San Francisco to Moscow, 13 November 1945 Reissue ( A more complete version of documents previously released in first Venona release on 10 July 1995) (Release Six)
- John Earl Haynes and Harvey Klehr, Venona: Decoding Soviet Espionage in America (New Haven: Yale University Press, 1999).