During Nazi German occupation in 1939 – 1945 , the German Gestapo investigation unit and court were established at the prison . The Czech prison guards were replaced by Waffen SS members . Thousands of Czech people , from members of the resistance to alleged black marketeers , were detained here before being sent to execution sites , especially the Kobylisy Shooting Range , to other prisons within Nazi Germany , or to concentration camps . The prison capacity was boosted to 2,200 , and it became the largest prison in the occupied country . In spring 1943 the Nazi Germans started carrying out executions directly inside the facility itself , where three cells had been adapted for this purpose
Kobylisy Shooting Range
Kobylisy Shooting Range
Pankrác Prison