Seven Miles from Alcatraz (1942)

After Pearl Harbor convicts at Alcatraz prison live in fear of bomb attacks driving Champ Larkin and his pal Jimbo to a desperate escape attempt which lands them on a tiny lighthouse island where they take over The five inhabitants are stymied in their efforts to summon aid But the island also figures in the schemes of a big Nazi spy ring which will win out the gangsters greed or their patriotism