Pay their employees hazard pay. Give them the right to choose if they want to come to work and risk getting sick or stay home.
Why is this important?
Every skilled trade worker has no choice but to come to work. While at work you are putting your health and your family health at risk because you're working around a lot of people. You don't know who's sick. Working in these fields you're putting your health your family health and the general public health at risk. Most jobs like these don't or can't practice social distance or anything else that could help prevent you from getting sick.