
Yellow dog contracts, also known as yellow dog clauses or ironclad oaths, were agreements between employers and employees that forbade employees from joining or remaining members of labour unions. These contracts were used by employers to maintain control over their employees and prevent them from collective bargaining, demanding better working conditions, and higher wages. While yellow dog contracts first appeared in the 19th century, they were outlawed in the United States under the Norris-LaGuardia Act of 1932, which made them unenforceable in federal courts. This act, along with subsequent legislation and judicial decisions, have rendered yellow dog contracts largely obsolete and illegal under US labour law today.
| Characteristics | Values |
|---|---|
| Year of origin | 1870s |
| Other names | Ironclad oath, Infamous Document, Yellow Dog Clause |
| Agreement | Employee agrees not to be a member of a labor union |
| Effect on employees | Employees are prevented from collective bargaining |
| Effect on employers | Employers maintain control over their employees |
| Legality | Outlawed in the private sector in 1932 under the Norris-LaGuardia Act; Outlawed in the public sector in the 1960s |
| Current use | Largely unenforceable today |
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What You'll Learn
- Yellow dog contracts forbid employees from joining or remaining members of labour unions
- They are illegal and unenforceable under US labour law
- They were used by employers to maintain control and prevent collective bargaining
- The Norris-LaGuardia Act of 1932 made them unenforceable in federal courts
- The National Labor Relations Act of 1935 further solidified workers' rights to organise and join unions

Yellow dog contracts forbid employees from joining or remaining members of labour unions
Yellow dog contracts are agreements between employers and employees that forbid employees from joining or remaining members of labour unions. They were used by employers to prevent the formation of unions and to take legal action against employees who engaged in union activities. These contracts were first seen in the 19th century as "ironclad" or "infamous documents", with the term "yellow dog" coming into use in the 1920s as a derogatory term for employees who signed such agreements.
The use of yellow dog contracts was common in the early 20th century, particularly in industries such as coal mining, metalworking, and railroads. Employees were forced to sign these agreements as a condition of their employment, giving up their rights to collective bargaining and union representation. This often left employees vulnerable to exploitation and unsafe working conditions.
In the United States, the Norris-LaGuardia Act of 1932 made yellow dog contracts unenforceable in federal courts, a pivotal moment in labour law. This was followed by the National Labor Relations Act of 1935 (also known as the Wagner Act), which further solidified workers' rights to organise, join unions, and engage in collective bargaining. The National Labor Relations Board (NLRB) was established to enforce labour laws and address unfair labour practices, including the use of yellow-dog contracts.
Today, yellow dog contracts are considered illegal and unenforceable under U.S. labour law. Employers cannot require employees to sign agreements that prohibit union membership or participation as a condition of employment. While yellow dog contracts may still appear in the form of non-compete agreements, they are no longer common and are generally unenforceable.
The legal landscape surrounding yellow dog contracts has evolved significantly, with subsequent legislation and judicial decisions rendering them largely obsolete. The decline of these agreements can be attributed to legal changes and the efforts of labour activists fighting for workers' rights.
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They are illegal and unenforceable under US labour law
Yellow dog contracts are illegal and unenforceable under US labour law. This type of contract, which forbids employees from joining or remaining members of labour unions, was outlawed in the United States under the Norris-LaGuardia Act of 1932. This Act was a pivotal moment in labour law, making yellow-dog contracts unenforceable in federal courts.
The National Labor Relations Act of 1935 (also known as the Wagner Act) further solidified workers' rights to organise, join unions, and engage in collective bargaining. It also established the National Labor Relations Board (NLRB) to enforce labour laws and address unfair labour practices, including the use of yellow-dog contracts.
Yellow dog contracts were a significant obstacle to the labour movement, as they prevented workers from organising and joining unions. They were used by employers to maintain control over their employees and to prevent them from collective bargaining. The contracts were also used to prevent employees from engaging in any activity with a union while they were on a company's payroll, including prohibiting them from going to work for a competitor.
The use of yellow dog contracts has been largely eradicated, but the principles of fairness, transparency, and respect for workers' rights remain essential components of modern labour relations. Today, employers cannot require employees to sign agreements that prohibit union membership or participation as a condition of employment.
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They were used by employers to maintain control and prevent collective bargaining
Yellow dog contracts were used by employers to maintain control over their workforce and prevent collective bargaining. They were agreements between an employer and an employee in which the employee agreed not to join or remain a member of a labour union as a condition of their employment. This allowed employers to prevent the formation of unions and maintain control over labour relations.
The use of yellow dog contracts dates back to the 1870s, when they were commonly referred to as "ironclad" or "infamous" documents. By the early 20th century, they were being used by industries such as railroad companies, coal mining companies, and metalworking companies to prevent unionization and maintain control over labour relations. For example, mining companies used these agreements to prevent miners from organizing and demanding better wages and safer working conditions.
The benefits of yellow dog contracts for employees were minimal and were outweighed by the lack of protections and bargaining power that came with union representation. These contracts were seen as a way for employers to prevent union organizing and collective bargaining, which are crucial components for improving workers' rights and wages. Many workers were pressured into signing these contracts, forcing them to choose between their jobs and union representation.
The legality of yellow dog contracts began to face scrutiny in the early 20th century, and they were eventually outlawed in the United States under the Norris-LaGuardia Act of 1932. This Act prohibited federal courts from issuing injunctions in non-violent labour disputes and made yellow-dog contracts unenforceable in federal courts. The National Labor Relations Act of 1935 (also known as the Wagner Act) further solidified workers' rights to organize, join unions, and engage in collective bargaining, making yellow-dog contracts illegal and unenforceable.
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The Norris-LaGuardia Act of 1932 made them unenforceable in federal courts
Yellow-dog contracts, also known as yellow-dog clauses, are agreements between employers and employees in which the latter agrees not to join a labour union as a condition of employment. These contracts first appeared in the 1870s and were used by employers to prevent the formation of unions, often by taking legal action against union organisers.
In 1932, yellow-dog contracts were outlawed in the United States under the Norris-LaGuardia Act, which was passed during the Great Depression. The Act was co-sponsored in Congress by George Norris and Fiorello La Guardia, and signed into law by President Hoover. The Norris-LaGuardia Act made yellow-dog contracts unenforceable in federal courts by prohibiting courts from enforcing such contracts and issuing injunctions against labour unions. Specifically, the Act states that no court in the United States has the jurisdiction to issue any restraining order or injunction in any case involving a labour dispute to prohibit individuals from:
- Refusing to perform work or remain in an employment relationship.
- Becoming or remaining a member of a labour organisation or employer organisation.
The Act also prohibited employers from interfering with or restraining employees' freedom of association, self-organisation, and designation of representatives of their choosing to negotiate employment terms and conditions. This marked a significant shift in public opinion against employers who sought to prevent unionisation and judges who limited normal union activities through court injunctions.
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The National Labor Relations Act of 1935 further solidified workers' rights to organise and join unions
Yellow-dog contracts, also known as yellow-dog clauses, are agreements between employers and employees that prevent the latter from joining labour unions. These contracts first appeared in the 19th century and were used by employers to prevent the formation of unions and to take legal action against union organisers. In 1932, yellow-dog contracts were outlawed in the private sector under the Norris-LaGuardia Act, although they continued to be permitted in the public sector until the 1960s.
The National Labor Relations Act (NLRA) of 1935, also known as the Wagner Act, further solidified workers' rights to organise and join unions. The Act was signed into law by President Franklin Roosevelt on July 5, 1935, and established the National Labor Relations Board (NLRB). The NLRB was created to address disputes between unions and employers in the private sector and to enforce and maintain the rights of employees to organise and join unions. The NLRA applies to all employers involved in interstate commerce except airlines, railroads, agriculture, and government.
The broad intention of the NLRA was to guarantee employees the right to self-organisation, to form, join, or assist labour organisations, to bargain collectively, and to engage in concerted activities for the purpose of collective bargaining or other mutual aid and protection. The Act also sought to promote the full flow of commerce by prescribing the legitimate rights of both employees and employers in their relations and to protect the rights of individual employees in their relations with labour organisations.
The NLRA was bitterly opposed by the Republican Party and business groups, who viewed it as a threat to freedom. Despite this opposition, the Act was upheld as constitutional by the Supreme Court in 1937. The Wagner Act, along with other factors, contributed to the tremendous growth of membership in labour unions, particularly in the mass-production sector.
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Frequently asked questions
A yellow dog contract is an agreement between an employer and employee that forbids the employee from joining or remaining a member of a labour union as a condition of their employment.
Yellow dog contracts were outlawed in the United States under the Norris-LaGuardia Act of 1932, which made them unenforceable in federal courts.
Yes, the National Labor Relations Act of 1935 (also known as the Wagner Act) further solidified workers' rights to organise, join unions and engage in collective bargaining.
Yes, yellow dog contracts were common in the early 20th century, particularly in the railroad and mining industries. They were used by employers to prevent the formation of unions and to maintain control over their employees.
The term "yellow dog" is believed to have first appeared in the spring of 1921 and is considered a derogatory term. It implies that employees who signed such agreements were submissive to their employers, forgoing their rights in exchange for job security.


































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