 Complete the following phrase:  The Entente and in particular, French prime minister Georges Clemenceau, progressively hardened their stance against Hungary, in favor of the Kingdom of Romania, the Kingdom of Serbs, Croats and Slovenes and the First Czechoslovak Republic. In order to both fulfill past promises and gain their support for the Allied intervention in the Russian Civil War. Its territory was restricted as result of the November 1918 Armistice of Belgrade and the March 1919 Vix Note. The latter led to the resignation of Count Mihály Károlyis government and the subsequent establishment of the Hungarian Soviet Republic on 21 March. The new communist government initiated a purge of its political opponents which later came to be known as the Red Terror, all while 