This literally happened with one ex-ASML Sr-level engineer who got lured into joining a U.S. based EUVL startup. Came in on B1/B2 (business) visa, was waiting months for an H1B (worker) visa to get processed. Got stopped by ICE in great state of Texas, divulged who he is, and what he is doing; got promptly detained and deported back to Nederland shortly.ICE will come along and arrest and deport those engineers and scientists.