Japanese Naval Codes - 1942 Chicago Tribune Incident

1942 Chicago Tribune Incident

In June 1942 the Chicago Tribune, run by isolationist Col. Robert R. McCormick, published an article that implied that the United States had broken the Japanese codes. This was a serious breach of national security. The government at first wanted to prosecute the Tribune under the Espionage Act of 1917. For various reasons, including the desire not to bring more attention to the article, the charges were dropped.

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