They Came to Blow Up America

They Came to Blow Up America is a 1943 American war spy film based on the World War II Operation Pastorius, directed by Edward Ludwig. It stars George Sanders and Anna Sten. It is also known as School for Sabotage and School for Saboteurs.

American attorney Carl Steelman Sanders stuns his Germanborn parents by telling them that he is a member of the German American Bund. His father Ludwig Stssel, a loyal American, is particularly incensed. When Carl attends a Bund meeting, his colleague Ernst Reiter divulges that he has been called back to Germany to be trained as a saboteur. The police break up the meeting fleeing, Reiter draws a gun and is shot dead. Later, Carl meets with Craig Carl is actually an FBI undercover agent. Craig informs him that he is to impersonate Reiter and infiltrate the school.In Hamburg, Carl becomes friendly with a woman named Helga Lorenz. Later, Colonel Taeger Dennis Hoey informs him that Helga is suspected of being in the German Underground, and orders him to continue seeing her to find incriminating evidence. After Carl accidentally finds some antiNazi leaflets, he warns Helga, but a spy with a telescope has witnessed this, so Carl has no choice but to denounce her himself. When she refuses to talk, Taeger orders her sent to a concentration camp. Carl manages to intercept the car taking her away and rescue her. ........

Source: Wikipedia