Which of the following is correct regarding "yellow dog contracts"?

The statement regarding "yellow dog contracts" being illegal contracts that prevent union membership as a condition of employment is accurate. Historically, yellow dog contracts were agreements that employers would require employees to sign, which stated that the employee would not join a union or engage in union activities. These contracts were a way for employers to maintain control over labor and limit the influence of unions during the early 20th century.

The legal landscape changed with the National Labor Relations Act of 1935, which made these agreements unenforceable and declared them illegal. The intent behind this legislation was to protect workers' rights to organize and engage in collective bargaining without facing penalties or restrictions from their employers. Understanding this context is crucial as it highlights the evolution of labor laws in the United States, emphasizing the shift towards supporting workers' rights rather than restricting them through practices like yellow dog contracts.