hat was the National Defense League of 1918?

I found letters of 1918. The paper has started falling apart as it’s quite old. There is a paper that has the following: 

“Consider the spy within !

Ought we endure him?

Unless we all do loyalize,

No one knows he’ll demoralize

Can’t we make it here so hot

In America’s melting pot,

Loyalty’ll pay for the whole planes lot.”

It’s seems to be letters exchanged from various people as there as several signatures. Letters talk about feeding Germans and making the town spy free.

It’s a bit hard to read everything as the letters are rolled up and the paper breaks when opened.

Documents were found hidden in a chimney. 

Not sure if this is the right section to post. Any help is appreciated.

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