What role did the Soviet fleet play in WWII?

In WWII, did the Germans keep the Soviet kolkhozes and state factories during their occupation of Ukraine and Western Russia?

Apart from German and English language movies, which are the best movies to watch on World War 2?

How many WW2 souvenirs did the US Army bring home from Germany and Japan?

How much more superior was American industry to Japanese before and during WW2?