Which organization is not a professional association for librarians?

The American Union of Library Employees is not considered a professional association for librarians in the same way the other organizations listed are. Professional associations typically focus on the professional development, advocacy, and networking opportunities specific to librarianship, while the American Union of Library Employees is more aligned with labor union activities, which often prioritize collective bargaining, worker rights, and employment conditions rather than the profession as a whole.

In contrast, the American Library Association, the International Federation of Library Associations, and the Special Libraries Association all serve as significant professional organizations that support librarians through resources, conferences, and guidelines that enhance library services and promote the role of libraries in society. These associations offer a platform for professional growth and the exchange of ideas among librarians worldwide, while the union is more focused on labor relations rather than professional advancement.