Based upon the 1933 kidnapping and murder of Brooke Hart, son of the owner of Hart's Department Store in San Jose, California. Two suspects were arrested and jailed, but a lynch mob broke into the jail, dragged out the suspects and took them across the street to a city park where they hanged them from a tree.
This was Cy Endfield's last American film before he was forced to decamp to the United Kingdom because of the Hollywood blacklist. Endfield managed to carve a reasonably successful career in Britain, directing such films as Hell Drivers (1957) and Zulu (1964).
Cy Endfield was not the only member of the cast and crew to fall foul of the House Un-American Activities Commission. Lloyd Bridges was also hauled up before them but managed to keep his career going by naming names.