One especially noteworthy aspect of this movie is the character of Ben Chaplin, played by the criminally underappreciated African American actor Canada Lee. A trademark of Lee's few but memorable screen roles is how his characters transcend the racial stereotypes of the day (see also his role in "Lifeboat"). Where Chaplin is black, his race is never mentioned, and is never even made an issue. There's no assumption of deferrence to the white characters. He is treated as an equal, which, especially for 1947, is an amazing breakthrough.
The other strengths of the movie, particularly Garfield's performance and James Wong Howe's cinematography, have been duly mentioned in other posts.
The other strengths of the movie, particularly Garfield's performance and James Wong Howe's cinematography, have been duly mentioned in other posts.