Why Was Hollywood at War with Poland?
The Left was very powerful among screenwriters in that period and many of the most unkind representations of Poles or Poland were the product of radical leftists, often members of the Communist Party. We must also remember that the Left had a particular grievance against Poland for several reasons. First, Poland was widely perceived on the Left as a reactionary country still preserving many of the characteristics of a bygone era. Secondly, the Poles had defeated Soviet Russia in the war of 1919-1921-a virtual sin to the pro-Soviet Left. Finally, Poland was the victim of a double assault in September 1939 by Nazi Germany and Soviet Russia. Hence any mention of Poland immediately raised the issue of Communist collaboration with the Nazis and the brief era when Hitler and Stalin were allies. Hence for the Left, Poland was at least an obstacle and at most an object of hatred. There was no pro-Polish element in Hollywood to counter the Left’s powerful animus against Poland.
Reviews here and here