The Provincial Christian-Socialist Party (Hungarian: Országos Keresztényszocialista Párt, OKszP; Czech: Zemská křesťansko-socialistická strana; German: Provinziell-Christlich-Sozialistische Partei) was the main political party of ethnic Hungarians in the First Czechoslovak Republic.
Its two main programmatic goals was the implementation of Slovak autonomy and the defence of the Christian ideology against communism.
Lelley was a partisan of the second option, but after a few years he lost the internal battle and was expelled from the party with his followers.
They went to the 1925 parliamentary elections under the name West Slovakian Christian Socialist Party (Hungarian: Nyugat-szlovenskói keresztény-szocialista párt, German: Westslowakische Christlichsoziale Partei, Czech: Západoslovenská křesťansko-sociální strana) but got only 17,285 votes, not enough for a parliamentary seat.
[2] On 21 June 1936 the party merged with the Hungarian National Party into Egyesült Magyar Párt (EMP, United Hungarian Party) led by János Esterházy as national executive chairman (until then leader of OKszP) and Andor Jaross as national chairman.