From the movie Swing Kids, when Peter and Thomas steal a radio that they saw a Nazi steal from a "traitor's" home, did this scene actually...

Swing Kids is a historical fiction
film.  This means that the story itself is not explicitly factual but the events in the
film could have taken place in real life - and likely did.
Events and people in the movie were based on actual
history.

There were real swing kids.  Peter and Thomas are
probably based on actual people and real experiences - but they were not meant to be
historical figures.  The original scene of the Nazis confiscating the radio was also a
realistic portrayal of actual events.  Many times, Nazis stole valuable items from the
homes of "traitors" and Jews.  The music played and jazz musicians mentioned were also
factual.  The HJ was real.  The costumes were realistic replicas of the actual uniforms
of different Nazi groups.