<P> However, there have been three exceptional instances when ex post facto criminal laws have been used in Finland . </P> <P> Following the Finnish Civil War of 1918, the Parliament of Finland passed a law setting up tribunals to try suspected rebels . These tribunals issued death sentences in many cases, although very few of those accused could have committed a crime that carried the death penalty under Finnish law in force during the war . Several hundred people were executed under what was arguably an ex post facto legal arrangement . During the war, and before the tribunals were set up, thousands of people had been executed without trial by both sides . </P> <P> After World War II, Finland was under pressure to convict political leaders whom the Allied powers considered responsible for Finnish involvement in the war . An ex post facto law was passed in the autumn of 1945 to permit prosecution for war responsibility, and eventually eight politicians were convicted . </P> <P> In another post-war case, the weapons cache case, an ex post facto law was passed in 1947 so that military personnel could be prosecuted for unofficially preparing for guerrilla resistance in case of Soviet occupation . </P>

When was the ex post facto law created