On the next day , 22 January , the NKVD secret police troops began mass arrests of suspected participants in the uprising . Altogether , they incarcerated some 150 Poles . Twenty four students were brutally interrogated by the NKVD and tortured . Historian Jan Tomasz Gross writes that the plotters were beaten with wooden poles , handguns , bottles and metal bars , and " kicked until their jaws and ribs were broken . " Fifty five men were sentenced to exile in Siberia . Almost all of those murdered or expelled were male teenagers of Polish nationality from Czortkow . Also , officers of the Polish Army , kept in Czortkow prison , were among those murdered in the Katyn massacre later on
Katyn massacre
Katyn massacre
Czortków uprising