How's this for an idea: by law, many/all HR duties in corporations larger than X, must be conducted by independent, outside firms hired by the original corporation. They would be like tax auditor firms or credit card security auditors, but more involved.

This way, HR would more likely be incentivized to work for both employee and employer (because they are audited themselves), except in extreme corrupt cases. HR practice would also become a lot better, as it became more competitive and profitable. People with more knowledge of labor law and history would thrive. Yes, there would still be stooges working in these outside HR firms, but at least they would stooge for the real laws in place rather than corporate policies.