By Lila Shapiro First Posted: 1/5/12 01:57 PM ET A major pension fund and longtime investor in Walmart has blacklisted the retailing behemoth, citing poor labor practices and the company’s anti-union stance as the driving force behind its rejection. Walmart typically shrugs off criticism of its labor practices as union-driven propaganda and insists that its employees are happy and well-managed, but investing experts say that when one of the largest pension funds in the world divests, the company would be wise to listen to the message. It’s the same message the American labor movement has been pushing for decades. On Tuesday, the Netherlands’ biggest pension fund, Algemeen Burgerlijk Pensioenfonds, with more than $300 billion in assets, announced that it was blacklisting the largest retailer in the world for noncompliance with the United Nations’ Global Compact principles. The Global Compact presents a set of core values relating to human rights, labor standards, the environment and anti-corruption efforts. Sixteen other companies were blacklisted along with Walmart, nearly all of them excluded for producing chemical or nuclear weapons that violate the Nuclear Non-Proliferation Treaty. ABP said on Wednesday that the decision to pull its investment from Walmart was not hasty. The fund declined to say how much money is involved, but according to ABP records, it had invested some 95 million euros, worth $121 million today, in U.S. Walmart stores as of June 30, 2011. The fund first sent a letter to Walmart executives in 2008, a year after ABP formalized its responsible-investing policy. Four years later, after many meetings with employees and all levels of management, ABP concluded the retail giant was still falling short.