In Sweden, it is mandatory by law that employers must inform and negotiate with trade union organizations regarding major changes, such as mergers and acquisitions. The Chief of Staff (CoS) is responsible for ensuring that these processes are followed in accordance with the Collective Agreement Act (MBL). This means that the CoS involves trade union representatives early in the process, informs about planned changes, and creates forums for dialogue and joint analysis. The CoS documents all negotiations and ensures that decisions are made by consensus, reducing the risk of conflicts and legal disputes. In the case of post-merger integration, it is also important for the CoS to ensure that labor law and collective agreements are respected. By working structuredly and transparently on labor law issues, the CoS strengthens both legitimacy and trust in the integration process, which is crucial for long-term success.