AinOhdMilvado — See my above post which addresses your scenario:
If he is doing it intentionally, and it is illegal, it is a Chillul Hashem according to all opinions. If his employees were Jewish it would be considered a Chillul Hashem in public (much worse) — that aspect may not apply if it is only in front of non-Jews. If what he does is not illegal, but immoral by all standards, it would also be a Chillul Hashem. If it just viewed as immoral because his employees expect more from a supposedly religious person, it is likely still a Chillul Hashem, although there may be different opinions on this.
Of course that just addresses the Chillul Hashem aspect. Someone running a business in an illegal or unethical way is likely violating many other aveiros as well.