After establishment of Slovak State (1939) which had about 65,000 ethnic Hungarians the party (under name "Szlovenskói Magyar Párt", "Hungarian Party in Slovakia") remained as one of few allowed political parties (the others being Hlinka's Slovak People's Party and Deutsche Partei of ethnic Germans in Slovakia). During Slovak National Uprising (1944) the party was banned on the area controlled by insurgents. The ban was reconfirmed after the end of World War II.