Flip the question. Who would maintain such a list at their own expense? Who would force employers to contribute information which could get the employer sued to the list? Until/unless the government actually passes such laws (which they have not) forcing employers to contribute such information and pays for the cost of maintaining such a list, there is no possibility of such a list occurring. Any lists which actually exist are as a result of some law forcing people to provide information and the government paying to maintain such a list.