john dillinger. >> when machine gun kelly was captured, he begged g-men don't shoot, meaning government men, and the name g-men flashed in the news. >> during the mid-'30s, j. edgar hoover and the fbi became national heroes. before they knew it, they really had turned the bureau of investigation into public heroes, and hoover himself was even called public hero number one by some publicists. >> but while hoover was wiping the floor with gangsters, a storm was once again brewing across the ocean. barely 14 years after the end of world war i, germany was again on the rise. by 1933, hitler was chancellor and established the third reich and began his master plan for world domination and racial tiering. although the united states was an ocean away, it didn't escape hitler's plan. >> the nazis had a very dangerous idea. the idea was anywhere there was a distraction anywhere in the world, they were to be officially represented by nazi germany. hitler would speak for them. >> the author of "espionage, the greatest spy operations throughout history." >> they looked over the united states and said there's about 30 million americans of german descent over there. what