As early as March 1933, two months after Hitler was appointed Chancellor, the Sturmabteilung began to attack trade union offices without legal consequences. Several union offices were occupied, their furnishings were destroyed, their documents were stolen or burned, and union members were beaten and in some cases killed; the police ignored these attacks and declared itself without jurisdiction.

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The German Labour Front (DAF) was then created in May 1933 as the organization that was to take over the assets seized from the former trade unions. Robert Ley, who had no previous experience in labour relations, was appointed by Hitler to lead the DAF upon its creation. Three weeks later, Hitler issued a decree that banned collective bargaining and stated that a group of labour trustees, appointed by him, would “regulate labour contracts” and maintain “labour peace.”

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https://en.wikipedia.org/wiki/German_Labour_Front