[BearCub]

The Constitution and Bill of Rights applies to government, not to private entities

Yes and no.

18 U.S.C. § 241 makes it a crime to conspire to deprive someone of their constitutional rights:

If two or more persons conspire to injure, oppress, threaten, or intimidate any citizen in the free exercise or enjoyment of any right or privilege secured to him by the Constitution or laws of the United States..., [t]hey shall be fined not more than $10,000 or imprisoned not more than ten years, or both; and if death results, they shall be subject to imprisonment for any term of years or for life.

The real question is, where do your constitutional rights end? The answer is simple: They end at your employer's doorstep (or gate, or whatever).

I think any employer attempting to deprive a worker of his/her constitutional rights outside of the workplace would have a long row to hoe.

[BearCub]

Of course the problem with the law above is that it’s a criminal statute. You’d have to find a U.S. Attorney willing to bring the case. AFAIK it doesn’t create a private cause of action that would form the basis of a civil lawsuit.

[bruoz]

"The real question is, where do your constitutional rights end? The answer is simple: They end at your employer's doorstep (or gate, or whatever)."

So you're saying that I can be denied employment based on my age, race, sex or religion. I don't think so.

[tpaine]

NCLaw441 argues that anything an employer wished to require of his employees would be OK?
Regardless of of the Constitution or bill of rights?

El Gato erroneously claims:

The Constitution and Bill of Rights applies to government, not to private entities.

BearCub quotes 18 U.S.C. § 241, which makes it a crime to conspire to deprive someone of their constitutional rights:
If two or more persons conspire to injure, oppress, threaten, or intimidate any citizen in the free exercise or enjoyment of any right or privilege secured to him by the Constitution or laws of the United States...,

As we see above in the code, - your constitutional rights do not 'end' at your employer's doorstep (or gate, or whatever).

Our rights to own and carry arms are part of our "Law of the Land"

I think any employer [or 'private entity'] attempting to deprive a worker of his/her constitutional rights, both inside or outside of the workplace, - should have a long look at their own concepts about our constitution, and its protection of individual rights.

Private property rights do not trump our rights to carry arms. -- In rational people the two rights coexist without controversy.
How is your property threatened by an armed visitor or worker?