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Gunvald Jørg Tomstad (2 August 1918 – 12 May 1970) was a major agent of the British SIS, and a Norwegian resistance member during World War II. From 1941 to 1943, he was a mole or double agent while also operating a clandestine radio transmitter in the Flekkefjord area. These were two of the most dangerous roles in that war.