Walmart is possibly the largest violator of employment laws in the United States. Walmart, by corporate plan and design, intentionally violates the Americans with Disabilities Act (ADA) and other laws enacted to protect disabled workers.
Employees who quit their jobs can sue for wrongful termination under the doctrine of constructive termination or discharge. A constructive discharge occurs when working conditions become so intolerable that no reasonable person would be expected to continue. When conditions become such that an employee is forced to quit, this is considered to be the same as an involuntary termination.