Institutional voids are typically found in emerging economies. When governments lack in essential facilities, in order to ensure the well function of their supply chains, companies have to properly deal with this situation by themselves. An example is a situation happening in Rio Grande do Sul, Brazil, since 2013, where a sequence of investigations focused on the dairy industry. Due to a lack of regulation, milk was the target of adulterations throughout the supply chain processes of the companies. The frauds affected processes of companies from different sizes and nationalities. However, in this context, a local cooperative called Cooperativa Languiru, one of the leader dairy companies in the state, has different practices with its suppliers and was not affected by this contingency. Thus, the purpose of this research, through a case study, was to analyze the relationship between a dairy buying company and its suppliers in this environment of regulatory institutional voids. Aiming to have a wider perspective, this qualitative study explored how the lack of institutions affected the sector. As results, it was verified that political and economic interferences affect the chain as well as political lobby acts. Likewise, the lack of inspectors and infrastructure impact the well-functioning of it. Nevertheless, the close relation between the Cooperativa Languiru with its suppliers abled the company to have record results without having situations in terms of adulteration. Thus, this study proposed a research framework conceptualizing that firms must closely manage their relations with suppliers in order to deal with institutional voids.