When Did Johns-Manville Know? The case study titled, “When Did Johns-Manville Know?”, is primarily concerned with the issue of an employer’s liability with respect to the health and safety of its employees. This case deals specifically with how much of what an employer knows, or ought to know, about a potential hazard should be communicated to workers, and what steps the company is obligated to take in protecting workers from such dangers. In addition, the avoidance of cash payments to employees for damages by seeking relief through bankruptcy protection is also discussed. Today most people have heard, at least to some degree, about the potential health problems associated wi