What work ends with the call to action: ‘Working men of all countries, unite!’?

Question: What work ends with the call to action: ‘Working men of all countries, unite!’?

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Correct answer:

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7 little words

1. Two-door Plymouth model
2. Bruise around the eye
3. Roosting rod 7 Little Words
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6. Hairstyle 7 Little Words
7. Painter Jackson 7 Little Words
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