In 1923 there was a schism in the Silesian People's Party. Three factions appeared: one German-speaking (including Rudolf Francus, Walter Harbich, Karol Sikora, Arthur Wohrizek, Emmanuel Harbich, Otto Wohlman, Karl Kordula and Hans Peschke); a second Polish-speaking (including Karol Folwartschny, Gustaw Wałach, Józef Santarius, Adam Broda and Paweł Tomanek); and a third pro-Czech (including Karol Smyczek, Karol Pawlas and Alfred Farnik). The German-language faction started in some communal and all-district elections in a coalition with the German-minority election community. The Polish-language faction formed election coalitions with Polish minority parties. Kożdoń, as leader of all the party, linked these two factions. In some communes he stood for election alone. The pro-Czech faction cut ties with Kożdoń and became a separate organization, closely affiliated with the
Republican Party of Agricultural and Smallholder People. In communal elections it stood for election alone or entered Czech coalitions. Sometimes in one commune started all three factions of the SPP, which competed among themselves. In communal elections the SPP gained various success. Its two candidates (Rudolf Francus and Karol Sikora) were members in the
Český Těšín county council, and the number of its members in the town council of Český Těšín was still expanding (five in 1923, ten in 1927, twelve in 1931), and from 1923 to 1928, Kożdoń served four terms as mayor of Český Těšín. The SPP dominated the commune of
Svibice too, and it had a large number of communal council members, starting in various political configurations (alone as the Silesian People's Party, in a separate Polish-language faction, in a separate German-language faction, in a broad German and Polish coalition, and in various communal and citizens committees). The newspaper of the Polish-language faction was
Nasz Lud (Our People).
"Ślązak w Czechosłowacji" (Silesian in Czechoslovakia) and
Nasz Ślązak (Our Silesian) were the pro-Czech papers. The Czechs founded the organization Czech-Szlonzakian Unity (
Česko-šlonzacká jednota), which incorporated weak SPP organizations in Frydek county and connected it to the Czech political camp. The leading members of the Silesian People's Party in Czechoslovakia were: Józef Kożdoń, Rudolf Pierniczek, Karol Malina, Rudolf Francus, Walter Harbich in Český Těšín, Ludwik Niedoba i Alojzy Kuchejda in Jablunkov, Oswald Bayer in
Třinec, Gustaw Wałach in
Orlová, Robert Wallach in
Komorní Lhotka, Karol Sikora and Jan Pasterny in
Šumbark, Karol Kubik in
Lyžbice, Bruno Kappel in
Třanovice, Karol Bruck in Svibice and Józef Pellar in Bystrzyca. In the 1925 parliamentary elections in Czechoslovakia, the SPP formed a coalition with the
Polish minority parties: the Union of Silesian Catholics, the
Polish People's Party and the
Polish Socialist Workers Party. Gustaw Wałach, a member of the Szlonzakian movement, took third place, after
Leon Wolf from the Union of Silesian Catholics and Wiesław Wójcik from the Polish Socialist Workers Party. The election slogan of the Polish coalition was "Silesia for Silesians", which was originally an SPP slogan that all Polish organizations had opposed in the Austrian period. Leon Wolf was elected deputy. In 1927 the Czechoslovak authorities, against their own guarantees to the SPP, decided to connect
Czech Silesia with
Moravia. In response the mayor of
Opava, Ernst Franz, founded the Committee for the Protection of Silesian Rights, which opposed this decision. The committee produced a German-language brochure by Kożdoń, "Right of our Silesian homeland for administration unhabitance", in which he argued that the merging of Czech Silesia with Moravia was irrational, based on historical, social and economic issues. The SPP, the Union of Silesians and all the organizations of Polish and German minorities protested the decision, but authorities in
Prague ignored them. In the 1928 elections to the Silesia–Moravia regional assembly, the SPP formed a coalition with the Poles again. A Szlonzakian–Polish–Jewish election list included Gustaw Wałach from the SPP, but nobody from this list was elected. In the National Assembly elections in 1929 and the elections to Silesian-Moravian Regional Assembly in 1935, the SPP supported the Polish-Jewish list. In the National Assembly elections of 1935, the SPP supported Polish candidate
Karol Junga from a Polish-Slovak-Ruthenian list, the Autonomy Bloc. On the other hand, Walter Harbich, leader of the German-language faction, supported
Sudetendeutsche Partei. In 1938
Nazi Germany, claimed the
Opava Silesia and other Czechoslovak territories inhabited by ethnic German majorities. Poland claimed the
Trans-Olza region. In this situation, on 8 September 1938, the Silesian People's Party, as "representative of the Silesian nationality", sent a message to the representative of the United Kingdom,
Sir Walter Runciman, thait reminded him of the question of the plebiscite in 1920. In the new emergency, the SPP demanded four allied powers to execute a plebiscite regarding the future of Cieszyn Silesia. The petition, to which was attached Kurt Witt's work "Die Teschener Frage" ("The Cieszyn question"), was signed by Kożdoń as mayor of Český Těšín, along with Bruno Kappel, Karol Kubik, Robert Wallach, Walter Harbich and Český Těšín county council member Rudolf Francus. On 18 September 1938 Walter Harbich as leader of the "assembly of the Silesian nationality" sent a telegram to
Adolf Hitler, requesting the independence of Cieszyn Silesia under the protection of
Nazi Germany. Another petition about the issue was sent to the British prime minister,
Neville Chamberlain. ==Decline==