[1] The mentally unstable Tandefelt shot the Finnish Minister of Internal Affairs Heikki Ritavuori dead at Ritavuori's home door at Nervanderinkatu 11 in Etu-Töölö, Helsinki on 14 February 1922, to affect Finland's politics in the Kindred Nations Wars (heimosodat) taking place in Eastern Karelia.
The event was the only murder of a government minister and the only political assassination in the entire history of independent Finland.
Tandefelt has often been suspected of having acted because of an extreme right-wing conspiracy, but there is no binding evidence of this.
Later, the Supreme Court of Finland ordered him to undergo a mental health examination.
Tandefelt was legally found to be partially insane and the sentence was lowered to 12 years of hard labor.