In the late 1800s why might a potential new factory employee refuse to sign a yellow-dog contract?

In the late 1800s, a potential new factory employee might refuse to sign a yellow-dog contract because such contracts typically required workers to agree not to join or support labor unions, limiting their rights and protections. Many workers were aware of the harsh working conditions, low wages, and lack of job security, and they might have valued the collective bargaining power that unions provided. Additionally, signing such a contract could be viewed as a betrayal of fellow workers, fostering a sense of solidarity against exploitative practices. Ultimately, the refusal could stem from a desire for better working conditions and the freedom to advocate for their rights.