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yel·low-dog contract(yĕl′ō-dôg′, -dŏg′)
An employment contract, no longer legal, in which an employee agrees not to join a labor union during the term of employment.
(Industrial Relations & HR Terms) US a contract with an employer, now illegal, in which an employee agreed not to join a trade union during his employment
[C20: from US yellow-dog anti-trade union, from yellow dog mongrel, contemptible person]
a preemployment contract with an employer, no longer enforceable, in which a worker agrees not to join a union while employed.