Slave and worker do NOT mean the same thing. By definition, a slave does not receive compensation for the work performed. The Master / slave relationship is different than an management / worker relationship. Please do not use the left’s tactic of false equivalency and attempt to confuse the two.
Again, a worker (someone who is compensated for their efforts by management) CAN NOT be exploited. There is the possibility of defrauding wages agreed to but that stops when the worker no longer works for management. In other words, when management executes an act that is viewed by the worker as a breach of the employment contract, the worker stops being a worker.
A worker who dies on the job because of hazardous working conditions isn't an exploited worker, either, because once he's dead he's not a worker. Added bonus, for this reason as well, it will be permanently impossible to exploit him.
Yup, looks like you've solved the problem, all right.