Multiple reports have documented the failures of voluntary corporate social responsibility (CSR) codes in global supply chains, but less attention has been paid to how they have been implemented in the United States. This report is a case study of how McDonald’s Corporation implemented its Supplier Code of Conduct when it was alerted to violations of workers’ rights to freedom of association at one of its suppliers, Taylor Fresh Foods, commonly known as Taylor Farms. The report documents systematic and serious violations of workers’ fundamental rights protected under international labor standards and McDonald’s own Supplier Code of Conduct to freely associate and bargain collectively at Taylor Farms. Further, it finds that McDonald’s approach not only failed to prevent or remediate grave violations of workers’ rights, it helped undermine workers’ free exercise of their rights.