Altonan vangit

It was very long ago, but this film touched me deeply. A became obsessed with Shostakovich's 11th Symphony, and remember vividly some scenes. When Maximillian Schell is finally "released" and goes out into the city (Hamburg?) to see what Germany has become, he is repulsed. When Frederich March is told he will die, he is solemn. The plot, that they have hidden their son because he is a wanted war criminal. That they collaborated willingly with the Nazis, as an industrial power. Perhaps I have forgotten important details. But the movie resonates with me.