"Hire normal people who depend on you for their income." yes! that's it! Be sure you're the one in control, ensuring your ability to treat them as less than human!

Sorry for the snark, but that last line may be pretty unintentionally revealing. employer/employee relations are a complex relationship which requires a delicate balance of power. Having the employee be entirely dependent on the employer is just as damaging (to both parties!) as having a keystone employee who knows he can't be replaced. I'd replace your last line with "Hire equals who you can treat as equals."

"Authority is solvent to humanity."