@izzythepush,
You like to have boxing matches and keep your opponent from fighting back. In the 1900s a tunnel was built through a mountain to divert the New River for hydroelectric. Massive number of workers begin to die. The cause was the sandstone dust which was a known cause of death for a thousand years. The engineers and bosses were provided with masks the employees did not have any. As soon as blasting was done the employees were forced back into the tunnel with the dust so thick you could not see. When employees became sick the sheriff was called and they were forced to work at the point of a gun. There was a shortage of land to bury the bodies.
When the case went to court a foreman testified that "we knew we were going kill those niggers we just didn't know we would kill them this soon." In this case the term niggers was used to describe Italians and other nationalities. Would you describe them as slaves? They were being paid but forced to work at the point of a gun. The treatment of workers did not change much from Egypt till New River.
The highly skilled are treated differently. In New River the engineers and the bosses didn't die they were given masks.
They did not kill the slaves? There would be several archologists who would disagree they found the bones.
Your source for your information was a known liar.