Which term describes an organization representing employees in negotiations with employers?

The term that accurately describes an organization representing employees in negotiations with employers is "trade union." Trade unions are established specifically to advocate for the interests of workers, ensuring that their rights are defended in discussions regarding wages, working conditions, benefits, and other employment-related matters. They engage in collective bargaining on behalf of their members to secure better terms of employment through organized representation.

Trade unions also serve a crucial role in empowering employees by providing them with a collective voice, enabling them to negotiate more effectively than they could as individuals. This organized representation fosters solidarity among workers, helping to promote labor rights and improve conditions within various industries.

On the other hand, the other options do not encapsulate the role of representing employees in negotiations to the same extent. A company board refers to a group of individuals tasked with overseeing the management of a corporation, but it does not represent the interests of employees. A worker's association might convey a sense of collective membership but typically lacks the formal power to engage in negotiations similar to that of a trade union. A professional federation often pertains to organizations representing specific professions or industries, primarily focusing on professional standards and advocacy rather than direct negotiation with employers over labor conditions.