A yellow-dog contract required workers to agree not to join a union as a condition of their employment.

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A yellow-dog contract was a type of agreement that banned workers from joining a union as a condition of their employment. It was used by employers in the early 20th century to prevent workers from organizing and demanding better wages and working conditions. The name "yellow-dog" comes from the idea that workers who signed such contracts were so desperate for employment that they would even "sell out" their fellow workers by agreeing not to join a union.

A Yellow-Dog Contract Required Workers to Agree Not to Join