Stanley Tucci tells the story of Leon Lewis who hunted down Nazis on the streets on LA in the 30s and 40s.

With its aircraft factories and shipyards, California consumed ten per cent of the US war budget. That made it a prime target for Nazis hoping to disrupt the war effort.

Leon Lewis swung into action, infiltrating LA's Nazi groups. Meanwhile, California drew in more people and money than ever before, sowing the seeds of its post-War economic success.

Academic consultant: Dr Ian Scott, University of Manchester

Written and produced by Laurence Grissell