Seeger underwent what appears to be his first major investigation after writing a letter to the California American Legion in 1942 criticizing the organization's resolution "advocating deportation of all Japanese, citizens or not, and barring all Japanese descendants from citizenship." This was during a time Japanese-Americans, many of them from California, were being forced to live in government internment camps.

"We're fighting precisely to free the world of such Hitlerism, such narrow jingoism," Seeger wrote.

What followed was a wide-ranging probe by the military into Seeger's background.

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