Who, in 1918 after regaining independence, imagined the right would send their political opponents to the camp?
Actually, it was a Sanation, ruled by Marshal Pilsudski with roots in PPS [Polish Socialist Party], who sent their political opponents to place of isolation at Bereza Kartuska and not the other way around.
And many of those were were imprisoned there were ONR members [National Radical Camp]: Zygmunt Dziarmaga, Władysław Chackiewicz, Jan Jodzewicz, Edward Kemnitz, Bolesław Piasecki, Mieczysław Prószyński, Henryk Rossman, Włodzimierz Sznarbachowski i Bolesław Świderski to name a few.
Before sending @gumishu back to school perhaps you should visit a library yourself first? ;-)