However, I'll withdraw the claim regarding employment since it's not necessary to make my primary case and I don't really wish to argue it further.
Instead, I'll shift the goalposts a bit and point out that regardless of whether or not the hiring of employees constitutes interstate commerce, the selling of the goods and services produced by the firms in question
does constitute interstate commerce, as does the acquisition of supplies and resources necessary to facilitate that production. It seems to me that the logic laid out
US v Darby would be rather applicable to Bernie's proposal and would contradict your assessment of it.