Free Labor Will Win" poster
The pattern
This still is filed under Us-versus-them positioning.
Define
The buyer is invited into a side. The product is what we use. The named other is what we refuse.
Mechanism
Identity contrast. Choosing the offer is choosing a group. The out-group does as much work as the claim.
Verdict
The category is crowded
Why it works
It elevates blue-collar factory work to the same heroic, patriotic level as military combat. The specific choice of the word "free" implicitly contrasts American labor with Axis forced labor, giving the worker a sense of ideological superiority and national importance.
Steal this when
You need to boost morale among a workforce by framing their daily, often repetitive labor as a heroic contribution to a larger ideological or national struggle.