Newspapers carried cartoons like these emphasizing the dangers that enemy aliens might present to the nation. They greatly exaggerated the danger enemy aliens represented to the public. Newspapers also carried stories and photos of contraband being turned in to local authorities by enemy aliens.
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Two dangers authorities warned about: using (now banned) shortwave radios to signal the enemy, and posing as members of U.S. Armed forces.
This photo from the Dec. 30, 1941 San Francisco Chronicle depicts an alien turning in his radio with shortwave band to the police. The headline of the accompanying article reads: “Alien Cameras, Radios, Guns Deluge Police.”