Ferenc Szálasi was the leader of the Arrow Cross Party – Hungarist Movement, the "Leader of the Nation", being both head of State and prime minister of the Kingdom of Hungary's "Government of National Unity" for the final six months of Hungary's participation in World War II, after Germany occupied Hungary and removed Miklós Horthy by force. During his brief rule, Szálasi's men murdered 10,000–15,000 Jews. After the war, he was tried and executed by the Hungarian court for war crimes and crimes against humanity committed during World War II.