opinion. Iron Kingdom: The Rise and Downfall of Prussia. Pine, Lisa (2011) 2010. Authors of books left the country in droves and some wrote material critical of the regime while in exile. The Nazi Persecution of the Churches. Several Catholic leaders were targeted in the 1934 Night of the Long Knives assassinations. Lanham, MD: Rowman Littlefield. From the start of the war, a British blockade on shipments to Germany affected its economy. At the Potsdam Conference in August 1945, the Allies arranged for the Allied occupation and denazification of the country.