What is another word for yellow dog contracts?
Pronunciation: [jˈɛlə͡ʊ dˈɒɡ kˈɒntɹakts] (IPA) 
Yellow dog contracts, also known as ironclad contracts, are employment agreements that prohibit workers from joining or forming a labor union. Such contracts were common during the late 19th and early 20th centuries in the United States, particularly in industries such as mining, agriculture, and manufacturing. They were often used by employers to prevent worker organizing and maintain control over the labor force. Synonyms for yellow dog contracts include ironclad agreements, anti-union contracts, and union-free agreements. These terms all refer to agreements that limit or prohibit workers from joining or forming a labor union, and are generally seen as unfavorable to workers' rights and collective bargaining.
