SeanusYes I have just googled it, Sikorski does talk about that side of the story in his book: full circle.
This is what google says: After the Soviet takeover of the area, on March 17, 1945 the Red Army took the camp over and continued to operate it, this time the institution housed German prisoners of war.
A transit camp, run by the Ministry of Internal Security and commanded by Czesław Gęborski (later put on trial for crimes against humanity for his actions in the camp), was also created nearby, serving as an internment, labor and resettlement camp for German Silesians,[2] as a "verification" point for Silesians,[2] as well as a camp for former veterans of the Anders' Polish II Corps, whom the new communist authorities of Poland saw as dangerous. Out of 8000[3] internees, it is estimated that between 1000 and 1,500 German civilians died in the camp,[2][3][4] mostly by typhus and maltreatment[2] from camp officials.
Oh, yes - 'Nice (treaty) or death!" ("Nicea albo smierć!")
It's funny that you attribute this slogan to Kaczyński.
In fact, it was said by Jan Maria-Rokita - Platforma Obywatelska MP at that time.
My mistake, although i think that Kaczynski did borrow the term as well.
As for Jan Maria-Rokita, what a nut job!