"NKVD has executed tens of thousands of prisoners" . . . "massacred over 4,000 prisoners in Lviv and around 10,000 throughout western Ukraine in other prisons" . "executing its political prisoners" . "massacres of prisoners" . . . . . "NKVD prisoner massacres in Poland" . "NKVD prisoner massacres" . . "massacres of political prisoners" . . "massacred many to prevent them from falling into German hands" . "NKVD prison" . . "massacres of Polish political prisoners" . . . "Russia" . "chose to kill all inmates" . . "killed thousands of prisoners" . . "NKVD organized prisoner massacres" . "massacre prisoners" . "thousands of political prisoners" . . . . "evacuated and killed prisoners" . . "handle the situation" . . . "NKVD prisoner massacres" . "killed most of the prison population" . . "NKVD massacred thousands of anti-Soviet prisoners" . . . . . . . "apprehended and executed by the NKVD" . . . "killed more than 1,000 prisoners in June/July 1941" . . . . . "political prisoners murdered by the NKVD" . . "deportation and massacres of prisoners" . "NKVD to kill" . . . . "interrogated, tortured and executed" . . . "responsible for political prisons" . "murdered thousands of prisoners" . . "NKVD terror" . . . "prisoners were massacred" . "NKVD massacred" . "he was executed" . . . "execution by the NKVD" . . "were executed" . "mass murder" . . "NKVD prisoner massacres in Ukraine" .