It was founded in September 1937 by left-wing and nonpartisan Sanation politicians, in response to the growing fascist movement in Poland.
Key members of the organisation included Marceli Handelsman, Mieczysław Michałowicz, Wincenty Rzymowski, and Alfred Fiderkiewicz.
It was proposed by Mikołaj Kwaśniewski, in the opposition to right-wing faction of Sanation politicians forming the Camp of National Unity, and the growing fascist movement in Poland.
It was later followed by Kraków, Łódź, Lviv, Vilnius, Katowice, Sosnowiec, Bielsko, Poznań, Kalisz, and Gdynia.
Among its most important members were Marceli Handelsman, Mieczysław Michałowicz, Wincenty Rzymowski, and Alfred Fiderkiewicz.