Toxic workplaces can harm your physical and mental health, Surgeon General says

This seems to be answered reasonably-well: "The findings, which may come as no surprise to many workers, are significant in that they are first time the Surgeon General has explicitly linked job factors such as low wages, discrimination, harassment, overwork, long commutes and other factors to chronic physical health conditions like heart disease and cancer. Work-related stress can also lead to mental health conditions including depression and anxiety, according to the report."

In the long arc of workers rights, it typically takes decades of harm to establish a need for protection. Enumerating harms and their root causes informs the details of legislation to come.