 During the "June Days", as the Łódź uprising in 1905 came to be known in Poland, armed clashes broke out between gunmen loyal to Piłsudski's PPS and those loyal to Roman Dmowski's National Democratic Party ("Endeks").It was also not unanimously supported by all members of the PPS; in November 1906, a faction of the party split off in protest of Piłsudski's leadership.The Piłsudski's faction was known as "Old Faction" or the "Revolution Faction" (Starzy, Frakcja Rewolucyjna), while their opponents were known as the "Young Faction", "Moderate Faction" or the "Left Wing" (Młodzi, "Frakcja Umiarkowana", Lewica).