1924: Norway’s decision to extend diplomatic recognition to the Soviet Union was impelled, in part, by the need to find markets for the Norwegian herring catch. Twelve years later, herrings again played an unexpected role in bilateral relations. The Norwegian government, fearful that the Soviets would halt purchases of the fish, gagged the political exile Leon Trotsky, and then put him on board a ship to Mexico.
Source: Donald Rayfield, Stalin and His Hangmen: An Authoritative Portrait of a Tyrant and Those Who Served Him (2004), pp. 259–60, 261, 271