Employers across the country are being sued by the families of workers who contend their loved ones contracted lethal cases of Covid-19 on the job, a new legal front that shows the risks of reopening workplaces.

Walmart Inc., Safeway Inc., Tyson Foods Inc. and some health-care facilities have been sued for gross negligence or wrongful death since the coronavirus pandemic began unfolding in March. Employees’ loved ones contend the companies failed to protect workers from the deadly virus and should compensate their family members as a result. Workers who survived the virus also are suing to have medical bills, future earnings and other damages paid out.