 Complete the following phrase:  The Bubeneč Popper house and surrounding land was confiscated by the Nazi German authorities on 16 March 1939, a day after the German occupation of Czechoslovakia, and was subsequently used as the Prague headquarters of the Gestapo German secret state police. It was in this period of time that the embassy was fitted with a series of tunnels which housed Gestapo archives as well as a security hallway connecting the tunnels to the embassy. In 1945, after the end of the war, the family attempted to reclaim the property, but were prevented from doing so due to the nationalisation decrees of Beneš, who returned to Czechoslovakia as President. Although Beneš was aware that the CzechJewish banker was still alive and intended to return to Prague, the property was granted to the Soviet Union by Beneš as a gift in thanks for the 