
A yellow-dog contract is an agreement between an employer and an employee that prevents the employee from joining a labour union. These contracts date back to the 1870s in the United States, where they were used by employers to prevent the formation of unions and take legal action against union organisers. Yellow-dog contracts were outlawed in the US under the Norris-LaGuardia Act of 1932, which declared such contracts unenforceable in any court. Today, similar agreements more commonly take the form of non-compete clauses, which prohibit employees from working with competing companies.
| Characteristics | Values |
|---|---|
| Type of contract | Agreement between an employer and an employee |
| Employee agrees to | Not be a member of a labor union |
| Other names | Ironclad oath, Infamous Document |
| Origin | 1870s, United States |
| Outlawed | 1932, under the Norris-LaGuardia Act |
| Validity | Outlawed in the private sector; allowed in the public sector until the 1960s |
| Purpose | Prevent the formation of unions, allow employers to take legal action against violators |
| Other forms | Non-compete agreements |
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What You'll Learn
- Yellow dog contracts were allowed in the public sector until the 1960s
- The Norris-LaGuardia Act of 1932 made yellow dog contracts unenforceable
- Yellow dog contracts can appear as non-compete agreements
- Employees can refuse employment if they value union membership over the position
- The term 'yellow dog' was coined in the 1920s

Yellow dog contracts were allowed in the public sector until the 1960s
A yellow dog contract is an agreement between an employer and an employee in which the employee agrees, as a condition of employment, not to join a labour union. The term "yellow dog" was originally coined in the 1920s to describe the individual signing the agreement, implying that only a "yellow dog" would willingly sign away their constitutional rights for employment.
Yellow dog contracts date back to the 1870s, when they were upheld by law. During this time, it was common for employers to include clauses in their employment contracts that compelled employees to renounce their right to join a labour union upon accepting employment. These contracts were initially used to prevent the formation of unions and allowed employers to take legal action against union organizers.
In 1932, yellow dog contracts were outlawed in the United States private sector under the Norris-LaGuardia Act. However, they continued to be permitted in the public sector, including federal jobs, until the 1960s. This meant that employees in public sector jobs, such as teachers, were still required to sign away their rights to join a union as a condition of their employment.
The persistence of yellow dog contracts in the public sector until the 1960s reflects the evolving landscape of labour rights and the ongoing struggle for worker autonomy and freedom of association. By the 1960s, public sector yellow dog contracts were finally deemed unlawful and unenforceable, marking a significant shift in the recognition of labour rights and worker protections.
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The Norris-LaGuardia Act of 1932 made yellow dog contracts unenforceable
Yellow-dog contracts are agreements between employers and employees in which the employee agrees, as a condition of employment, not to be a member of a labour union. These contracts were used by employers to prevent the formation of unions and allowed them to take legal action against union organisers. The term "yellow dog" was originally coined in the 1920s, referring to employees who signed away their rights under the Constitution to join unions.
The Norris-LaGuardia Act of 1932, also known as the Anti-Injunction Bill, was a federal law that made yellow-dog contracts unenforceable in the United States. The Act banned yellow-dog contracts, prohibited federal courts from issuing injunctions in non-violent labour disputes, and created a positive right of non-interference by employers against workers joining trade unions. The legislation was sponsored by Senator George W. Norris of Nebraska and Representative Fiorello H. La Guardia of New York, both Republicans, and it marked a significant turning point in labour relations.
Prior to the Act, in the 1917 case of Hitchman Coal & Coke Co. v. Mitchell, the United States Supreme Court established the Hitchman doctrine, which held that yellow-dog contracts were enforceable. This decision led to a substantial increase in judicial injunctions against labour unions and made organising a union without employer consent extremely difficult. The Norris-LaGuardia Act of 1932 reversed this situation, weakening employers' ability to use yellow-dog contracts and paving the way for subsequent legislation and judicial decisions that have rendered them largely obsolete.
While the Norris-LaGuardia Act made yellow-dog contracts unenforceable in the private sector, they were still allowed in the public sector, including many government jobs, until the 1960s. 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 established the National Labor Relations Board (NLRB) to enforce labour laws and address unfair labour practices, including the use of yellow-dog contracts, which are now considered illegal and unenforceable under U.S. labour law.
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Yellow dog contracts can appear as non-compete agreements
Yellow dog contracts are agreements between an employer and an employee in which the employee agrees, as a condition of employment, not to be a member of a labour union. They are used by employers to prevent the formation of unions and allow them to take legal action against union organisers.
Yellow dog contracts originated in the 1870s as written agreements commonly called "ironclad" or "infamous" documents containing anti-union agreements. By 1887, 16 states had determined that forcing employees to sign these agreements was criminal activity. Over time, yellow dog contracts became less important and, by the 20th century, they were largely irrelevant.
While yellow dog contracts typically took the form of non-union agreements, they could also appear as non-compete agreements, prohibiting employees from working for a direct competitor and potentially harming the current employer. This type of agreement is particularly beneficial to employers as it allows them to take legal action against employees who violate the agreement.
In 1932, yellow dog contracts were outlawed in the United States under the Norris-LaGuardia Act, which established that the government should not interfere with employees' rights to organise. Despite this, yellow dog contracts continued to be used in the public sector, including government jobs, until the 1960s.
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Employees can refuse employment if they value union membership over the position
A yellow-dog contract is an agreement between an employer and an employee in which the employee agrees, as a condition of employment, not to be a member of a labour union. In other words, employees who value union membership are well within their rights to refuse employment that requires them to sign a yellow-dog contract.
In the United States, such contracts were used by employers to prevent the formation of unions, often by permitting employers to take legal action against union organisers. The phrase "yellow dog" was originally coined in the 1920s, signifying what employees were seen as in the eyes of their peers for signing away rights that they were entitled to in the United States Constitution. For example, it was common for people to ask, "What kind of person is willing to be a 'yellow dog' and sign their rights away just to get a job?"
Yellow-dog contracts were outlawed in the United States under the Norris-LaGuardia Act in 1932, which deemed them a violation of the Fifth Amendment to the Constitution. This Act forbids employers from interfering with, restraining, or coercing employees in the exercise of rights relating to organising, forming, joining, or assisting a labour organisation for collective bargaining purposes. Similarly, labour organisations may not restrain or coerce employees in the exercise of these rights. Examples of employer conduct that violates the law include threatening employees with the loss of jobs or benefits if they join or vote for a union or engage in protected concerted activity.
It is important to note that employees who object to full union membership may continue as 'core' members and pay only that share of dues used directly for representation, such as collective bargaining and contract administration. This is known as the Beck right, created by a Supreme Court ruling. Additionally, in 27 states, union-security agreements have been banned through the passing of so-called "right to work" laws, which allow each employee to decide whether or not to join the union and pay dues, even though all workers are protected by the collective bargaining agreement negotiated by the union.
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The term 'yellow dog' was coined in the 1920s
The term "yellow dog" was coined in the 1920s, referring to employees who signed away their rights under the US Constitution. The phrase first appeared in the spring of 1921 in articles and editorials in the labour press. It was used to describe employees who, in the eyes of their peers, had degraded themselves to the level of a "yellow dog" by signing away their rights.
The use of the term "yellow dog" in relation to contracts can be traced back to the 1870s in the United States. These contracts, known as "infamous" or "ironclad" documents, were written agreements containing anti-union pledges. Employees who signed these contracts gave up their right to join a labour union. By 1887, 16 states had criminalised forcing employees to sign such agreements.
Yellow dog contracts, or clauses within contracts, are agreements between an employer and an employee in which the employee promises not to join a labour union. These contracts were used by employers to prevent the formation of unions and to take legal action against union organisers. While yellow dog contracts were outlawed in the private sector by the Norris-LaGuardia Act in 1932, they continued to be allowed in the public sector, including government jobs, until the 1960s.
Today, yellow dog contracts are more commonly seen in the form of non-compete agreements, where employees are prohibited from working for a company's direct competitor. These contracts are beneficial to employers as they protect their business interests and prevent potential harm caused by employees working for rival companies.
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Frequently asked questions
A yellow dog contract is an agreement between an employer and an employee in which the employee agrees, as a condition of employment, not to be a member of a labour union.
No, yellow dog contracts were outlawed in the United States under the Norris-LaGuardia Act of 1932, which declared any contract involving a yellow dog unenforceable in any court, according to federal law.
The phrase "yellow dog" was coined in the 1920s to signify what employees were seen as in the eyes of their peers for signing away rights that they were entitled to in the United States Constitution.































