The Polish National Department (PND, ) was a major organization of Polish-American Polish diaspora in United States around and after World War I.Adam Walaszek, POLISH IMMIGRANTS IN THE USA AND THEIR HOMELAND 1914-1923 Originally the Polish Central Relief Committee and based in Chicago, it organized relief for war-torn and newly independent Second Polish Republic. Prominent activists included world-famous pianist and future prime minister of Poland, Ignacy Jan Paderewski and former Illinois Treasurer John F. Smulski.Maciej Sierkierski, Helena Paderewska: Memoirs, 1910-1920 (Hoover Institution Press 2015) pp. 54, 115
PND was aligned to Polish endecja faction of Roman Dmowski, and opposed to Committee of National Defense (CND, Komitet Obrony Narodowej, KON), aligned to Józef Piłsudski's faction.
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Further reading M. B. B. Biskupski, "The Polish National Department, 1916-1925: A Review Essay," Polish American Studies 47, no. 2 (1991): 81–86.