In 1928 the "National Party" (Stronnictwo Narodowe) was founded, as a successor party to the Popular National Union. In the beginning, the new party adopted the same political line as its predecessor. After the official banning of the Camp of Great Poland, radicalized youth entered the National Party. The ideological clash between the old and new generation of National Democrats culminated at the party convention in 1935 where the younger activists were elected to lead the party. In 1936–1939 the personnel changes within the party continued, and the young generation totally began its complete domination. The older generation of National Democrats, disagreeing with the new course, left active politics or exited the party completely. A chief characteristic of ND policies at this time was their emphasis on Polonization of minorities: ND politicians such as Dmowski and Stanisław Grabski contributed to the failure of Piłsudski's proposed "Międzymorze" federation and the alliance with the Ukrainian leader Symon Petlura, as well as to the alienation of Poland's ethnic minorities.