They should be able to. Just not without notification. We shouldn't be the Western nation where it happens.
I say to let employers & employees define their relationship.
That is greater liberty that having government impose it.
I sense that some here are confusing liberty with morality.
And this leads them to believe that which is more moral,
has greater liberty. Not so. Tis better to recognize that
sometimes restricting liberty is useful, eg, licensing of
professions such as doctors, lawyers, CPAs.
We'll have no total liberty in any government. I favor
balancing liberty & limitations more on the side of liberty.