Rule of law is fundamental to organized human society.
We taxpayers provide a huge, expensive federal Department of Labor which is primarily for the unions. It handles - labor law - almost exclusively, not employment law. The NLRB is exclusively for organized labor.
Labor law is for organized labor and collective bargaining - unions.
Employment law is for everyone. There is no “Department of Employment”. Mostly employment law just give employees a “right to sue” their employers.