Richard Sorge.
He was a Soviet spy posing as a German journalist and businessman in Japan.
He was arrested in mid-October, 1941 and hanged (by the Japanese, not the Soviets) in 1944.
Since the war-changing information about the Japanese decision not to attack Siberia was transmitted in late September of ‘41, if the Japanese had arrested him three weeks earlier the war might have had a different outcome.
http://en.wikipedia.org/wiki/Richard_Sorge
Your anecdote about Stalin’s ingratitude may be true, but not about Sorge.
Great info -thanks. I will delve into it. Perhaps when Stalin was informed about it, he made the remark. I will let you know-thanks.