They don’t even need to do that. They can still issue H1-B visas but break the link between the visa and the sponsoring employer. It should also be clear that H1-B holders cannot be penalized for joining unions. That’ll greatly reduce exploitation of H1-B visa holders, it’ll resolve the scabbing issue since they could then change jobs for better pay, and it’ll provide a market-based corrective to abusive employment practices.
They don’t even need to do that. They can still issue H1-B visas but break the link between the visa and the sponsoring employer. It should also be clear that H1-B holders cannot be penalized for joining unions. That’ll greatly reduce exploitation of H1-B visa holders, it’ll resolve the scabbing issue since they could then change jobs for better pay, and it’ll provide a market-based corrective to abusive employment practices.