[anonymouskimmer]

A refusal to do business over a controversy has a First amendment claim to assembly and petition. No federal law has any business limiting such a claim outside of literal matters of life and death.

I can see an argument that the Commerce clause grants powers to regulate such claims, but unfortunately federal laws in pursuit of a Constitutional power are still subordinate to Constitutional rights (IMO). It would require a Constitutional amendment to so empower a federal law to override a Constitutional right (again, IMO, as I'm writing to your "legitimacy" question posed to the GP).