The major political parties during Second Polish Republic were the National Democrats and other right-wing groups, various Peasant Parties, Christian Democrats, Polish Socialist Party, and political groups of ethnic minorities (German: German Social Democratic Party of Poland, Jewish: General Jewish Labour Bund in Poland, United Jewish Socialist Workers Party, and Ukrainian: Ukrainian National Democratic Alliance). Frequently changing governments (see Polish legislative election, 1919, Polish legislative election, 1922) and other negative publicity which the politicians received (such as accusations of corruption or 1919 Polish coup attempt), made them increasingly unpopular. Major politicians at this time included peasant activist Wincenty Witos (Prime Minister three times) and right-wing Roman Dmowski. Ethnic minorities were represented in the Sejm; e.g. in 1928–1930 there was the Ukrainian-Belarusian Club, with 26 Ukrainian and 4 Belarusian members..
Wikipedia