Why would another country like Hungary make an alliance with Nazi Germany and help to allow the mass murder of so many of its citizens?
Shortly after the Nazis came to power, the Hungarian government, led by Miklós Horthy, built an alliance with Nazi Germany. Hungary wanted to regain territorial gains which they had lost after the First World War. This combined with a rise in sympathy for fascism and Nazi ideas in Hungary, encouraged the country to join the Axis Alliance in November 1940.
In line with the Nazis policies towards Jews, in 1941 the Hungarian government deported approximately 20,000 non-Hungarian Jews to Ukraine, where they were murdered by the Einsatzgruppen.