In a National Emergency, Does the Constitution Still Apply?

An essential principle of the United States is that it is a free country, with individual liberties guaranteed, and government power limited.  That concept is now being tested.  A deadly worldwide pandemic has led to draconian lockdowns, forced closings of businesses, and even mandatory “stay at home” orders, some with Orwellian, friendly sounding names like “Safer at Home” or “Stay Home, Stay Healthy” – but still mandatory and enforced by police.